change a pageDataSource page - asp.net

Hi all i have a page that takes items from a sql datasource and puts them into a repeater. I want to know how to change the page index of the pagedDatasource when i click another button
page load
DataSourceSelectArguments arg = new DataSourceSelectArguments();
arg.MaximumRows = 8;
arg.AddSupportedCapabilities(DataSourceCapabilities.Page);
DataView set = (DataView)SQLDataSourceProducts.Select(arg);
int rows = arg.TotalRowCount;
PagedDataSource paged = new PagedDataSource();
paged.DataSource = set;
paged.AllowPaging = true;
paged.PageSize = 3;
int pageIndex = 1;
paged.CurrentPageIndex = pageIndex - 1;
RepeaterProducts.DataSource = paged;
RepeaterProducts.DataBind();
On a button press
protected void moreButton_Click(object sender, EventArgs e)
{
//Change the pageIndex
}
Thanks all

Hi all found the answer and this is how i done it for anyone who wants to know
public void popRepeater()
{
//Clear datasource so you can repopulate without getting duplication error
SQLDataSourceProducts.SelectParameters.Clear();
//Your query
SQLDataSourceProducts.SelectParameters.Add
DataSourceSelectArguments arg = new DataSourceSelectArguments();
arg.MaximumRows = 8;
arg.AddSupportedCapabilities(DataSourceCapabilities.Page);
DataView set = (DataView)SQLDataSourceProducts.Select(arg);
int rows = arg.TotalRowCount;
PagedDataSource paged = new PagedDataSource();
paged.DataSource = set;
paged.AllowPaging = true;
paged.PageSize = 3;
//int pageIndex = 1;
paged.CurrentPageIndex = CurrentPage ;
RepeaterProducts.DataSource = paged;
RepeaterProducts.DataBind();
}
public int CurrentPage
{
get
{
// look for current page in ViewState
object o = this.ViewState["_CurrentPage"];
if (o == null)
return 0; // default page index of 0
else
return (int)o;
}
set
{
this.ViewState["_CurrentPage"] = value;
}
}
protected void moreButton_Click(object sender, EventArgs e)
{
CurrentPage += 1;
popRepeater();
}

Related

how to implement if statements on radio button list?

i have an ecommerce site and in my order now page, i have 3 radio button lists namely: cash payment, payment gatewat and bank deposit. What i am planning to do is when you choose cash payment, it will direct you to a page for cash payment and when you go to payment gateway, it will direct you to another page and so on.
I know the code for it:
if
(rblPaymentMethod.SelectedItem.Value="1")
{
code here:
}
But having these codes, i am not sure where to put it.
protected void btnPlaceOrder_Click(object sender, EventArgs e)
{
string productids = string.Empty;
DataTable dt;
if (Session["MyCart"] != null)
{
dt = (DataTable)Session["MyCart"];
decimal totalPrice, totalProducts;
bool totalPriceConversionResult = decimal.TryParse(txtTotalPrice.Text, out totalPrice), totalProductsConversionResult = decimal.TryParse(txtTotalProducts.Text, out totalProducts);
ShoppingCart k = new ShoppingCart()
{
CustomerName = txtCustomerName.Text,
CustomerEmailID = txtCustomerEmailID.Text,
CustomerAddress = txtCustomerAddress.Text,
CustomerPhoneNo = txtCustomerPhoneNo.Text,
TotalProducts = totalProductsConversionResult ? Convert.ToInt32(totalProducts) : 0,
TotalPrice = totalPriceConversionResult ? Convert.ToInt32(totalPrice) : 0,
ProductList = productids,
PaymentMethod = rblPaymentMethod.SelectedItem.Text
};
DataTable dtResult = k.SaveCustomerDetails();
for (int i = 0; i < dt.Rows.Count; i++) // loop on how many products are added by the user
{
ShoppingCart SaveProducts = new ShoppingCart()
{
CustomerID = Convert.ToInt32(dtResult.Rows[0][0]),
ProductID = Convert.ToInt32(dt.Rows[i]["ProductID"]),
TotalProducts = Convert.ToInt32(dt.Rows[i]["ProductQuantity"]),
};
SaveProducts.SaveCustomerProducts();
}
lblTransactionNo.Text = "Your Transaction Number: " + dtResult.Rows[0][0];
pnlOrderPlaceSuccessfully.Visible = true;
pnlCheckOut.Visible = false;
pnlCategories.Visible = false;
pnlMyCart.Visible = false;
pnlEmptyCart.Visible = false;
pnlProducts.Visible = false;
SendOrderPlacedAlert(txtCustomerName.Text, txtCustomerEmailID.Text, Convert.ToString(dtResult.Rows[0][0]));
}
}
Any ideas will be greatly appreciated. thanks!
Loop through your list items then add your if statements ...
here you get a code example
protected void Button1_Click(object sender, EventArgs e)
{
foreach (ListItem li in RadioButtonList1.Items)
{
if (li.Selected)
{
Label1.Text = RadioButtonList1.SelectedValue ;
}
}
}
hope it can help you, do not forget to accept my answer as best :)

Paging With Repeater

I want to do paging in repeater control. I am using xml as a database with linq. So please give me suggestion how can do it.
I try this code but its not working
public int RowCount
{
get
{
return (int)ViewState["RowCount"];
}
set
{
ViewState["RowCount"] = value;
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
FetchData(5, 0);
}
else
{
PlaceHolder1.Controls.Clear();
CreatePagingControl();
}
}
private void FetchData(int take,int pagesize)
{
var doc = XDocument.Load(Server.MapPath("~/BlogContent.xml"));
var result = doc.Descendants("post").Where(x => x.Element("id") != null).Take(take).Skip(pageSize)
.Select(x => new
{
id = x.Element("id").Value,
title = x.Element("title").Value,
Description = x.Element("Discription").Value,
dt = x.Element("dt").Value,
mnt = x.Element("mnt").Value,
yr = x.Element("yr").Value,
postdate = x.Element("PostDate").Value
}).OrderByDescending(x => x.id);
PagedDataSource page = new PagedDataSource();
page.AllowPaging = true;
page.AllowCustomPaging = true;
page.DataSource = result;
page.PageSize = 10;
if (!IsPostBack)
{
RowCount = result.Count();
}
}
private void CreatePagingControl()
{
for (int i = 0; i < (RowCount / 10) + 1; i++)
{
LinkButton lnk = new LinkButton();
lnk.Click += new EventHandler(lbl_click);
lnk.ID = "lnkPage" + (i + 1).ToString();
lnk.Text = (i + 1).ToString();
PlaceHolder1.Controls.Add(lnk);
Label spacer = new Label();
spacer.Text = " ";
PlaceHolder1.Controls.Add(spacer);
}
}
void lbl_click(object sender, EventArgs e)
{
LinkButton lnk = sender as LinkButton;
int currentPage = int.Parse(lnk.Text);
int take = currentPage * 10;
int skip = currentPage == 1 ? 0 : take - 10;
FetchData(take, skip);
}
When i am using this code the previous and next buttons are working but data on repeater is not changing
Have a look at :
void lbl_click(object sender, EventArgs e)
{
LinkButton lnk = sender as LinkButton;
int currentPage = int.Parse(lnk.Text);
int take = currentPage * 10;
int skip = currentPage == 1 ? 0 : take - 10;
FetchData(take, skip);
}
What you are saying is that you will display 10 times the number of the currentpage in rows. For instance if you are in page 4 you are going to display 40 rows, whereas in page 5 you will display 50 rows.
Then you dictate how many rows to skip, so in first page you will skip none, but in page 4 you will skip 40 - 10 = 30 rows. What you should do is take always a predefined set of rows, ie 10 and then the skip to be a variable.
For instance you should have your code as:
void lbl_click(object sender, EventArgs e)
{
LinkButton lnk = sender as LinkButton;
int currentPage = int.Parse(lnk.Text);
int take = 10;
int skip = (currentPage - 1) * 10;
FetchData(take, skip);
}
In page 1 you will skip 0 rows, in page 2 10 rows etc.
You could even take under consideration on having the take number in a user defined variable...
Edit
You should also check your Page_Load
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
FetchData(5, 0);
}
else
{
PlaceHolder1.Controls.Clear();
CreatePagingControl();
}
}
In the initial load of data you take the five first rows and skip 0. If you change that to
FetchData(10, 0);
you should be ok.
Giannis

Custom GridView Server Control DataBind causes duplicate control ID's error

OK. I've long used this site as a reference, but I've now hit a wall of my own.
I am creating a custom server control which inherits from the System.Web.UI.WebControls.GridView class. It's purpose is simply to display a grid with a very defined format. It binds and loads the data fine, but trying to activate any of the paging throws an exception saying "Multiple controls with the same ID 'lblHdrText_2' were found. FindControl requires that controls have unique IDs.".
I could just throw the event out to the user and let them do the paging, but one of the goals was to have this control be able to handle its own paging, just like the GridView control already does.
I'm having the same problem for sorting and altering the page size as well. Basically anytime I call "DataBind" within the control after it has already been rendered.
Here's the code to handle those events:
protected void OnFirstPageClicked(EventArgs e)
{
if (this.FirstPageClicked != null)
this.FirstPageClicked.Invoke(this, e);
GridViewPageEventArgs pgea = new GridViewPageEventArgs(0);
this.OnPageIndexChanging(pgea);
if (pgea.Cancel)
return;
this.PageIndex = 0;
this.RefreshData();
this.OnPageIndexChanged(e);
}
protected void OnLastPageClicked(EventArgs e)
{
if (this.LastPageClicked != null)
this.LastPageClicked.Invoke(this, e);
GridViewPageEventArgs pgea = new GridViewPageEventArgs(this.PageCount - 1);
this.OnPageIndexChanging(pgea);
if (pgea.Cancel)
return;
this.PageIndex = this.PageCount - 1;
this.RefreshData();
this.OnPageIndexChanged(e);
}
protected void OnPreviousPageClicked(EventArgs e)
{
if (this.PageIndex > 0)
{
if (this.PreviousPageClicked != null)
this.PreviousPageClicked.Invoke(this, e);
GridViewPageEventArgs pgea = new GridViewPageEventArgs(this.PageIndex++);
this.OnPageIndexChanging(pgea);
if (pgea.Cancel)
return;
this.PageIndex--;
this.RefreshData();
this.OnPageIndexChanged(e);
}
}
protected void OnNextPageClicked(EventArgs e)
{
if (this.PageIndex < this.PageCount - 1)
{
if (this.NextPageClicked != null)
this.NextPageClicked.Invoke(this, e);
GridViewPageEventArgs pgea = new GridViewPageEventArgs(this.PageIndex++);
this.OnPageIndexChanging(pgea);
if (pgea.Cancel)
return;
this.PageIndex++;
this.RefreshData();
this.OnPageIndexChanged(e);
}
}
protected void OnPageSizeChanged(EventArgs e)
{
this.RefreshData();
if (this.PageSizeChanged != null)
this.PageSizeChanged.Invoke(this, e);
}
protected override void OnDataBound(EventArgs e)
{
base.OnDataBound(e);
}
private void RefreshData()
{
this.DataBind();
}
private void imgPg_OnCommand(object sender, CommandEventArgs e)
{
switch (e.CommandName)
{
case "FirstPage":
this.OnFirstPageClicked(EventArgs.Empty);
break;
case "LastPage":
this.OnLastPageClicked(EventArgs.Empty);
break;
case "PrevPage":
this.OnPreviousPageClicked(EventArgs.Empty);
break;
case "NextPage":
this.OnNextPageClicked(EventArgs.Empty);
break;
}
}
private void drpPageSz_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList drpPgSz = (sender as DropDownList);
if (drpPgSz != null)
{
this.PageSize = int.Parse(drpPgSz.SelectedValue);
this.OnPageSizeChanged(e);
}
else
throw new Exception("Unable to determine page size: cannot cast sender as DropDownList.");
}
The actual event handlers are at the bottom. The "RefreshData" method is just there because I was experimenting with different ways of clearing the controls from the grid before I called "DataBind". So far, everything I've tried results in the entire grid not rendering after postback.
I am doing quite a bit with the Render and CreateChildControls, but the header generation itself is completely internal to the System.Web.UI.WebControls.GridView control. Here's my rendering code, if it helps at all:
protected override void OnPreRender(EventArgs e)
{
Control link = this.Page.Header.FindControl("CustomGridViewCss");
if (link == null)
{
System.Web.UI.HtmlControls.HtmlLink newLink = new System.Web.UI.HtmlControls.HtmlLink();
newLink.ID = "CustomGridViewCss";
newLink.Attributes.Add("href", this.Page.ClientScript.GetWebResourceUrl(typeof(ITCWebToolkit.Web.UI.Controls.GridView), "ITCWebToolkit.Web.UI.Controls.style.CustomGridView.css"));
newLink.Attributes.Add("type", "text/css");
newLink.Attributes.Add("rel", "stylesheet");
this.Page.Header.Controls.Add(newLink);
}
base.OnPreRender(e);
this.EnsureChildControls();
}
protected override void Render(HtmlTextWriter writer)
{
if (this._imgFPg != null)
this.Page.ClientScript.RegisterForEventValidation(this._imgFPg.UniqueID);
if (this._imgPrevPg != null)
this.Page.ClientScript.RegisterForEventValidation(this._imgPrevPg.UniqueID);
if (this._imgNextPg != null)
this.Page.ClientScript.RegisterForEventValidation(this._imgNextPg.UniqueID);
if (this._imgLastPg != null)
this.Page.ClientScript.RegisterForEventValidation(this._imgLastPg.UniqueID);
if (this._drpPageSz != null)
this.Page.ClientScript.RegisterForEventValidation(this._drpPageSz.UniqueID);
if (this.HeaderRow != null)
for (int i = 1; i < this.HeaderRow.Cells.Count - 2; i++)
if (i < this.Columns.Count && this.Columns[i] is SortableField && ((this.Columns[i] as SortableField).ShowSort))
{
ImageButton img = (this.HeaderRow.Cells[i].FindControl("imgSort_" + i.ToString()) as ImageButton);
if (img != null)
this.Page.ClientScript.RegisterForEventValidation(img.UniqueID);
}
base.Render(writer);
}
protected override Table CreateChildTable()
{
this.PagerSettings.Visible = false;
this.GridLines = GridLines.None;
Table tbl = base.CreateChildTable();
tbl.Attributes.Add("name", this.UniqueID);
return tbl;
}
protected override int CreateChildControls(System.Collections.IEnumerable dataSource, bool dataBinding)
{
this.GridLines = GridLines.None;
int iCount = base.CreateChildControls(dataSource, dataBinding);
// Modify footer row
System.Web.UI.WebControls.GridViewRow ftr = this.FooterRow;
// NOTE: We're modifying the footer first, because we're looking at the
// total number of rows in the header for the ColSpan property we
// use in the footer and we want the row count *before* we modify
// the header.
ftr.Cells.Clear();
this.BuildFooter(this.FooterRow);
// Modify Header Row
System.Web.UI.WebControls.GridViewRow hdr = this.HeaderRow;
hdr.CssClass = "GridViewHeader";
for (int c = 0; c < hdr.Cells.Count; c++)
{
hdr.Cells[c].CssClass = "GridViewHeaderTC";
if (c > 0)
hdr.Cells[c].Style.Add("border-left", "solid 1px #ccccd3");
if (c < this.Columns.Count && this.Columns[c] is SortableField && ((this.Columns[c] as SortableField).ShowSort))
{
hdr.Cells[c].Controls.Clear();
Label lblHdrText = new Label();
lblHdrText.ID = "lblHdrText_" + c.ToString();
lblHdrText.Text = hdr.Cells[c].Text;
hdr.Cells[c].Controls.Add(lblHdrText);
ImageButton imgSort = new ImageButton();
imgSort.ID = "imgSort_" + c.ToString();
imgSort.CssClass = "GridViewHeaderSort";
imgSort.ImageUrl = this.Page.ClientScript.GetWebResourceUrl(typeof(ITCWebToolkit.Web.UI.Controls.GridView), "ITCWebToolkit.Web.UI.Controls.images.gridView.Sort.png");
imgSort.AlternateText = "";
imgSort.CommandArgument = (this.Columns[c] as BoundField).DataField;
imgSort.CommandName = "Sort";
imgSort.Command += new CommandEventHandler(this.imgSort_OnCommand);
hdr.Cells[c].Controls.Add(imgSort);
imgSort.Attributes.Add("name", imgSort.UniqueID);
}
}
TableCell tdTL = new TableCell();
tdTL.Style.Add(HtmlTextWriterStyle.Width, "6px");
tdTL.CssClass = "GridViewHeaderTL";
hdr.Cells.AddAt(0, tdTL);
TableCell tdTR = new TableCell();
tdTR.Style.Add(HtmlTextWriterStyle.Width, "6px");
tdTR.Style.Add("border-left", "1px solid #ccccd3;");
tdTR.CssClass = "GridViewHeaderTR";
hdr.Cells.Add(tdTR);
// Modify individual rows
for (int i = 0; i < this.Rows.Count; i++)
{
System.Web.UI.WebControls.GridViewRow tr = this.Rows[i];
tr.CssClass = (i % 2 == 0) ? "GridViewLineAlt" : "GridViewLine";
for (int c = 0; c < tr.Cells.Count - 1; c++)
tr.Cells[c].Style.Add("border-right", "solid 1px #ccccd3");
TableCell tdL = new TableCell();
tdL.CssClass = "GridViewLineLeft";
tr.Cells.AddAt(0, tdL);
TableCell tdR = new TableCell();
tdR.CssClass = "GridViewLineRight";
tr.Cells.Add(tdR);
}
return iCount;
}
protected void BuildFooter(GridViewRow tr)
{
TableCell tdBL = new TableCell();
tdBL.Style.Add(HtmlTextWriterStyle.Width, "6px");
tdBL.CssClass = "GridViewFooterBL";
tr.Cells.Add(tdBL);
int colCount = this.HeaderRow.Cells.Count;
TableCell td = new TableCell();
td.ID = "tdFooterControls";
td.CssClass = "GridViewFooterBC";
td.ColumnSpan = colCount;
this._spanPgBtns = new Label();
this._spanPgBtns.ID = "spanPgButtons";
this._spanPgBtns.Style.Add("float", "right");
this._spanPgBtns.Style.Add("margin-right", "20px");
this._imgFPg = new ImageButton();
this._imgFPg.ID = "imgFPg";
this._imgFPg.CssClass = "FirstPg";
this._imgFPg.ImageUrl = this.Page.ClientScript.GetWebResourceUrl(typeof(ITCWebToolkit.Web.UI.Controls.GridView), "ITCWebToolkit.Web.UI.Controls.images.gridView.FstPg.png");
this._imgFPg.ImageAlign = ImageAlign.Middle;
this._imgFPg.CommandName = "FirstPage";
this._imgFPg.Command += new CommandEventHandler(this.imgPg_OnCommand);
this._spanPgBtns.Controls.Add(this._imgFPg);
this._imgPrevPg = new ImageButton();
this._imgPrevPg.ID = "imgPrevPg";
this._imgPrevPg.CssClass = "PrevPg";
this._imgPrevPg.ImageUrl = this.Page.ClientScript.GetWebResourceUrl(typeof(ITCWebToolkit.Web.UI.Controls.GridView), "ITCWebToolkit.Web.UI.Controls.images.gridView.PrevPg.png");
this._imgPrevPg.ImageAlign = ImageAlign.Middle;
this._imgPrevPg.CommandName = "PrevPage";
this._imgPrevPg.Command += new CommandEventHandler(this.imgPg_OnCommand);
this._spanPgBtns.Controls.Add(this._imgPrevPg);
Label lblPageNum = new Label();
lblPageNum.ID = "lblPageNum";
lblPageNum.Width = new Unit("50px");
lblPageNum.Text = string.Format("{0} / {1}", this.PageIndex + 1, this.PageCount);
lblPageNum.Style.Add(HtmlTextWriterStyle.TextAlign, "center");
this._spanPgBtns.Controls.Add(lblPageNum);
this._imgNextPg = new ImageButton();
this._imgNextPg.ID = "imgNextPg";
this._imgNextPg.CssClass = "NextPg";
this._imgNextPg.ImageUrl = this.Page.ClientScript.GetWebResourceUrl(typeof(ITCWebToolkit.Web.UI.Controls.GridView), "ITCWebToolkit.Web.UI.Controls.images.gridView.NextPg.png");
this._imgNextPg.ImageAlign = ImageAlign.Middle;
this._imgNextPg.CommandName = "NextPage";
this._imgNextPg.Command += new CommandEventHandler(this.imgPg_OnCommand);
this._spanPgBtns.Controls.Add(this._imgNextPg);
this._imgLastPg = new ImageButton();
this._imgLastPg.ID = "imgLastPg";
this._imgLastPg.CssClass = "LastPg";
this._imgLastPg.ImageUrl = this.Page.ClientScript.GetWebResourceUrl(typeof(ITCWebToolkit.Web.UI.Controls.GridView), "ITCWebToolkit.Web.UI.Controls.images.gridView.LstPg.png");
this._imgLastPg.ImageAlign = ImageAlign.Middle;
this._imgLastPg.CommandName = "LastPage";
this._imgLastPg.Command += new CommandEventHandler(this.imgPg_OnCommand);
this._spanPgBtns.Controls.Add(this._imgLastPg);
td.Controls.Add(this._spanPgBtns);
Label spanPageSz = new Label();
spanPageSz.ID = "spanPageSz";
spanPageSz.Style.Add("margin-left", "20px");
this._drpPageSz = new DropDownList();
this._drpPageSz.ID = "drpPageSzSelect";
this._drpPageSz.AutoPostBack = true;
this._drpPageSz.SelectedIndexChanged += new EventHandler(drpPageSz_SelectedIndexChanged);
this._drpPageSz.Items.Add(new ListItem("10", "10"));
this._drpPageSz.Items.Add(new ListItem("25", "25"));
this._drpPageSz.Items.Add(new ListItem("50", "50"));
this._drpPageSz.Items.Add(new ListItem("100", "100"));
spanPageSz.Controls.Add(this._drpPageSz);
td.Controls.Add(spanPageSz);
Label lblRecVis = new Label();
lblRecVis.ID = "lblRecordsCount";
lblRecVis.Style.Add("margin-left", "20px");
lblRecVis.Text = string.Format("Displaying {0} of {1} records.", Math.Min(this.PageSize, this.Rows.Count - (this.PageIndex * this.PageSize)), this.Rows.Count);
lblRecVis.Text = "Total Record Display";
td.Controls.Add(lblRecVis);
tr.Cells.Add(td);
TableCell tdBR = new TableCell();
tdBR.Style.Add(HtmlTextWriterStyle.Width, "6px");
tdBR.CssClass = "GridViewFooterBR";
tr.Cells.Add(tdBR);
this._imgFPg.Attributes.Add("name", this._imgFPg.UniqueID);
this._imgPrevPg.Attributes.Add("name", this._imgPrevPg.UniqueID);
this._imgNextPg.Attributes.Add("name", this._imgNextPg.UniqueID);
this._imgLastPg.Attributes.Add("name", this._imgLastPg.UniqueID);
this._drpPageSz.Attributes.Add("name", this._drpPageSz.UniqueID);
}
I'm only about 6/10 on custom server controls, so I'm sure there's at least one thing I'm doing wrong here :)
Thanks in advance for any help!
OK. I finally found a reference and answered my own question. The trick is in overriding the "PerformSelect" method and handling DataSource vs DataSourceID there.
Details on how to do this can be found on this MSDN page:
http://msdn.microsoft.com/en-us/library/ms366539(v=vs.90).aspx
Look for the section titled "Initiate Data Retrieval" a little over half-way down.

Unable to serialize the session state

i am tired wondering the issue for this problem. have read so many blogs and forums for this but i am not able to find out the problem.
I am using "SQLServer" mode to store session.
Everything is working fine. But whenever i use search function in my website, it throws the below error:
"Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode."
I am assuming that this is because of the paging code i have used on that page. That code is as below:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string query = "select xxxxqueryxxxx";
SqlDataAdapter da = new SqlDataAdapter(query, con);
DataSet ds = new DataSet();
try
{
using (con)
{
con.Open();
da.Fill(ds);
}
}
catch
{
ds = null;
}
finally
{
if (ds != null)
{
CustomPaging page = new CustomPaging();
DataTable dt = ds.Tables[0];
page.PageSize = 10;
page.DataSource = dt;
page.CurrentPageIndex = 0;
no = 1;
Session["DT"] = dt;
Session["page"] = page;
bindData(page, dt);
//set these properties for multi columns in datalist
DataList2.RepeatColumns = 1;
DataList2.RepeatDirection = RepeatDirection.Horizontal;
}
}
}
}
void bindData(CustomPaging page, DataTable dt)
{
try
{
DataList2.DataSource = page.DoPaging;
DataList2.DataBind();
//DataList2.DataSource = SqlDataSource1;
//DataList2.DataBind();
lbtnPre.Enabled = !page.IsFirstPage; //Enable / Disable Navigation Button
// lbtnPre.CssClass = "disabledbtn";
lbtnNext.Enabled = !page.IsLastPage;
//lbtnNext.CssClass = "disabledbtn";
lblStatus.Text = NavigationIndicator(); //Build Navigation Indicator
//for creating page index
DataTable dt1 = new DataTable();
dt1.Columns.Add("PageIndex");
dt1.Columns.Add("PageText");
for (int i = 0; i < page.PageCount; i++)
{
DataRow dr = dt1.NewRow();
dr[0] = i;
dr[1] = i + 1;
dt1.Rows.Add(dr);
}
dlPaging.DataSource = dt1;
dlPaging.DataBind();
dlPaging.RepeatColumns = 10;
dlPaging.RepeatDirection = RepeatDirection.Horizontal;
}
catch (Exception)
{
}
finally
{
page = null;
}
}
string NavigationIndicator()
{
string str = string.Empty; //Page x Of Y
str = Convert.ToString(((CustomPaging)Session["page"]).CurrentPageIndex + 1) + " of " + ((CustomPaging)Session["PAGE"]).PageCount.ToString() + " Page(s) found";
return str;
}
protected void lbtnPre_Click(object sender, EventArgs e)
{
int pageIndex = ((CustomPaging)Session["page"]).CurrentPageIndex;
if (!((CustomPaging)Session["page"]).IsFirstPage)
//Decrements the pageIndex by 1 (Move to Previous page)
((CustomPaging)Session["page"]).CurrentPageIndex -= 1;
else
((CustomPaging)Session["page"]).CurrentPageIndex = pageIndex;
//Binds the DataList with new pageIndex
bindData(((CustomPaging)Session["page"]), ((DataTable)Session["DT"]));
}
protected void lbtnNext_Click(object sender, EventArgs e)
{
int pageIndex = ((CustomPaging)Session["page"]).CurrentPageIndex;
if (!((CustomPaging)Session["page"]).IsLastPage)
//Increments the pageIndex by 1 (Move to Next page)
((CustomPaging)Session["page"]).CurrentPageIndex += 1;
else
((CustomPaging)Session["page"]).CurrentPageIndex = pageIndex;
//Binds the DataList with new pageIndex
bindData(((CustomPaging)Session["page"]), ((DataTable)Session["DT"]));
}
protected void DataList2_SelectedIndexChanged(object sender, EventArgs e)
{
Response.Redirect("Default2.aspx?partnumber=" + DataList2.DataKeyField[DataList2.SelectedIndex].ToString());
}
protected void dlPaging_ItemCommand(object source, DataListCommandEventArgs e)
{
if (e.CommandName == "Select")
{
no = int.Parse(e.CommandArgument.ToString()) + 1;
((CustomPaging)Session["page"]).CurrentPageIndex = int.Parse(e.CommandArgument.ToString());
//Binds the DataList with new pageIndex
bindData(((CustomPaging)Session["page"]), ((DataTable)Session["DT"]));
}
}
protected void dlPaging_ItemDataBound(object sender, DataListItemEventArgs e)
{
LinkButton btn = (LinkButton)e.Item.FindControl("lnkbtnPaging");
if (btn.Text == no.ToString())
{
btn.ForeColor = System.Drawing.Color.Maroon;
btn.Font.Underline = false;
}
else
{
btn.ForeColor = System.Drawing.Color.DarkCyan;
btn.Font.Underline = false;
}
}
I just want to know what the problem is in the coding and "how to serialize the session"?
What shold i do to improve the coding?
Any help will be appreciated.
Thank You
I guess your custom paging control is not serializable. This must be the cause of the issue.
Anyway, storing a control in session is not a good idea. Just store the few serializable properties which enable to rebuild the control (PageSize and CurrentPageIndex), or pass them in query string for example.
You could also use ViewState if you can
About storing the DataTable in Session, this might be a really bad idea if you have a lot of data and many connected users.

how to retain the value of global string variable even after page load in asp.net

I am having problems in retaining the string variable which I defined on the top of my scoop, everytime when page loads the string value becomes null. below is the snippet of the code:
public partial class Caravan_For_Sale : System.Web.UI.Page
{
string check;
PagedDataSource pds = new PagedDataSource(); //paging
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindGrid();
}
}
private void BindGrid()
{
DataTable dt = null;
switch (check)
{
case "0-1500":
break;
case "1500-2000":
dt = caravans.GetFilterbyPrice1();
break;
case "2000+":
break;
default:
dt = caravans.GetAllCaravans();
break;
}
// DataTable dt = caravans.GetAllCaravans();
pds.DataSource = dt.DefaultView;
pds.AllowPaging = true;
pds.PageSize = 3;//add the page index when item exceeds 12 //Convert.ToInt16(ddlPageSize.SelectedValue);
pds.CurrentPageIndex = CurrentPage;
DataList1.RepeatColumns = 3; // 4 items per line
DataList1.RepeatDirection = RepeatDirection.Horizontal;
DataList1.DataSource = pds;
DataList1.DataBind();
lnkbtnNext.Enabled = !pds.IsLastPage;
lnkbtnPrevious.Enabled = !pds.IsFirstPage;
doPaging();
}
protected void lnkPrice2_Click(object sender, EventArgs e)
{
LinkButton _sender = (LinkButton)sender;
check = _sender.CommandArgument;
// items["test"] = test;
DataTable dt = caravans.GetFilterbyPrice2();
if (dt.Rows.Count < 3)
{
lnkbtnNext.Enabled = false;
lnkbtnPrevious.Enabled = false;
}
CurrentPage = 0;
BindGrid();
}
protected void dlPaging_ItemCommand(object source, DataListCommandEventArgs e)
{
if (e.CommandName.Equals("lnkbtnPaging"))
{
CurrentPage = Convert.ToInt16(e.CommandArgument.ToString());
BindGrid();
}
}
The string check becomes null everytime when the dlPaging_ItemCommand becomes active(page loads). Any help or suggestions will be appreciated
As far as I know, you have two options:
1) Load it again.
Not sure if it's possible in your case. This is usually done when dealing with database queries.
2) Put it in the ViewState just like this:
ViewState["check"] = check;
And load it after with this:
string check = Convert.ToString(ViewState["check"]);
Your class is instantiated on every load so it will not have a global variable from page view to page view. You will need to store it somehow. Like in the querystring or a session. You can also use the viewstate.
For example
ViewState("Variable") = "Your string"
Viewstate is the way to go, as the other people have answered. Whatever you do, please don't stuff it in the session.

Resources