I have a web form where there is one control list box and a data grid view to display data.
Everything works fine when I open the app for the first time, the list box is also perfectly loaded and all the data is displayed in the data grid view.
But when I click the submit button, the listbox data is lost and also the latest data I have entered in the app is not showing in the grid view.
protected void Page_Load(object sender, EventArgs e)
{
try
{
if(!IsPostBack)
{
new M_DropDown().Get_Ward(lstTole);
GridCustomer.DataSource = new M_GetUser().GetCustomer();
GridCustomer.DataBind();
}
DataTable dt = new M_GetUser().GetCustomer();
GridCustomer.DataSource = dt;
GridCustomer.DataBind();
}
catch (Exception) { throw; }
}
On submit button click, I have cleared all the controls.
protected void btnSubmit_Click(object sender, EventArgs e)
{
// other code blocks ommitted
case "1":
lblMessage.Text = "customer added successfully!!!";
div_message.Visible = true;
div_message.Attributes.Add("class", "callout callout-info");
txtHouseNumber.Value = string.Empty;
txtName.Value = string.Empty;
txtCustId.Value = string.Empty;
txtCustContact.Value = string.Empty;
lstTole.Items.Clear();
break;
}
Why is it so? Why I am not getting the listbox data and last inserted data on successful button submit event?
Related
I can successfully select the data I want to update to another page and populate my text boxes but if I set the selected values to my textbox and then try to update it wouldn't work and the same data is shown in database table.
However if I DO NOT set those values to my textboxes, then I can successfully update which is not what I am after.
I would like the user to see the data and record that s being updated
Here is my code:
protected void Page_Load(object sender, EventArgs e)
{
UserClassesDataContext db= new UserClassesDataContext();
var qr = from user in db.Users
where user.user_id == new Guid(Request.QueryString["user_id"])
select user;
foreach (var q in qr)
{
TextBox1.Text = q.user_name;
TextBox2.Text = q.password;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
UserClassesDataContext db = new UserClassesDataContext();
var qr = from user in db.Users
where user.user_id == new Guid(Request.QueryString["user_id"])
select user;
foreach (var q in qr)
{
q.user_name = TextBox1.Text;
q.password = TextBox2.Text;
}
db.SubmitChanges();
Response.Redirect("Default.aspx");
}
What am I doing wrong?
Thanks
The problem is, when you submit the button, the code inside Page_Load event is executing again.That means it is reading the data from your table and setting the value to textboxes(thus overwriting what user updated via the form ) and you are updating your record with this values (original values). So basically you are updating the rows with same values.
You can use the Page.IsPostBack property to determine whether the event is occurred by a postback(button click) or initial page load.
This should fix it.
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
{
// to do: read and set to textbox here.
}
}
I am working on a windows Forms Application and trying to validate few textboxes using errorproviders but the problem is when I am clicking on a button present in Tab 1, all the textboxes even present on a different tabs gets validated. I want the validation to occur for textboxes present on the current tab and not on any control present on any other tab. How can I achieve this? Please help. Below is the code related to validation in the click event.
private void btnCreateUser_Click(object sender, EventArgs e)
{
if (this.ValidateChildren(ValidationConstraints.Enabled))
{
// Some Code here
}
}
Below is code used for validating and validated event for one textbox. I am using similar code for other textboxes as well present on other tabs.
private void txtFirstNm_Validating(object sender, CancelEventArgs e)
{
bool cancel = false;
if (txtFirstNm.Text.Trim().Length == 0)
{
cancel = true;
errorProvider1.SetError(txtFirstNm,"Please enter First Name");
}
else
{
cancel = false;
errorProvider1.SetError(txtFirstNm, "");
}
e.Cancel = cancel;
}
private void txtFirstNm_Validated(object sender, EventArgs e)
{
errorProvider1.SetError(txtFirstNm,"");
}
The Scenario that is given in my question can be handled by using below code. We can use the ValidationConstraint as Visible and this will make sure that Validation occurs on the Current visible Controls.
private void btnCreateUser_Click(object sender, EventArgs e)
{
if (this.ValidateChildren(ValidationConstraints.Visible))
{
// Some Code here
}
}
I have a gridview on my ASP.NET application, I have set AutoGenerateColumns = false and programatically populating it. This gridview is in updatepanel Sorting and paging working fine. I have no issues with that. I have another page which is navigated on click of a particular column of this gridview and it shows more information of a record like master-detail. When browser back button is pressed, it goes on page one. I want it to remember the page I went from.
I have been searching for last 3 days. I have implented AddHistoryPoint, but its not working.
protected void detailsGrid_PageIndexChanged(object sender, EventArgs e)
{
if (ScriptManager1.IsInAsyncPostBack && !ScriptManager1.IsNavigating)
{
ScriptManager1.AddHistoryPoint("page", detailsGrid.PageIndex.ToString());
}
}
protected void ScriptManager1_Navigate(object sender, HistoryEventArgs e)
{
string indexPage = e.State["page"];
if (string.IsNullOrEmpty(indexPage))
{
detailsGrid.PageIndex = 0;
}
else
{
int pageNo = Convert.ToInt16(indexPage);
detailsGrid.PageIndex = pageNo;
loadmainGrid();
}
}
Try this:
int pageNo = Convert.ToInt16(indexPage);
loadmainGrid();
detailsGrid.PageIndex = pageNo;
I have a formview that on page load makes a call to a sql server and retrieves 5 records which I want the formview to paginate though.
I have sucessfully connected to the db, filled a dataset, and returned data when the web page renders. The problem is that when I move to a new page, the data does not change in the databound field.
Here is my code:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
conn = new SqlConnection(connstr);
ds = new DataSet();
da = new SqlDataAdapter("call to stored proc", conn);
try
{
conn.Open();
da.Fill(ds, "m");
FormView1.DataSource = ds;
FormView1.DataKeyNames = new string[] { "PropKey" };
FormView1.DataBind();
}
catch (Exception ex)
{
Result = ex.Message;
}
finally
{
conn.Close();
}
}
Next when the paginate buttons are clicked I have this:
protected void FormView1_PageIndexChanging1(object sender, FormViewPageEventArgs e)
{
FormView1.PageIndex = e.NewPageIndex;
}
Please help,
Thanks
You will need to bind the data to the FormView just after setting the new page index like below.
protected void FormView1_PageIndexChanging1(object sender, FormViewPageEventArgs e)
{
FormView1.PageIndex = e.NewPageIndex;
BindFormViewData();
}
This is required because the FormView only displays the data for the active record and does not store any other records from the datasource, so upon change of the page index, the datasource is required to be bound again. See: Paging in a FormView Web Server Control
From the above link:
If the FormView control is bound to a data source control, or to any
data structure that implements the ICollection interface (including
datasets), the control gets all the records from the data source,
displays the record for the current page, and discards the rest. When
the user moves to another page, the FormView control repeats the
process, displaying a different record.
Hope this helps.
I have a search textbox and a search button, when clicked displays a grid with the following names and gender.However I have redirected the page to another page on edit.Now When I comeback from that page to the page containing the gridview I want to display the same search again. I have successfully put retrieved the information but storing it into session, but I'm not able to call my btn_click event # page_Load.
Here's a snippet:
EDIT: I have made some changes in my code
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Redirected"] != null)
{
if (Session["FirstName"] != null)
txtSearch.Text = Session["FirstName"].ToString();
if (Session["Gender"] != null)
ddlGen.SelectedValue = Session["Gender"].ToString();
btnSearch_Click(sender, e);
}
if (!Page.IsPostBack)
{
BindGrid();
}
}
and here's the click event:
protected void btnSearch_Click(object sender, EventArgs e)
{
string query = "Select EmployeeId,FirstName,Password,Address,sex,Deptno,act_book,actTV,DOJ,isActiveYN from employees where 1=1";
if (txtSearch.Text != "")
{
query += " and FirstName like '%" + txtSearch.Text + "%'";
Session["FirstName"] = txtSearch.Text;
}
if (ddlGen.SelectedValue != "")
{
query += " and sex='" + ddlGen.SelectedValue.ToUpper() + "'";
Session["Gender"] = ddlGen.SelectedValue;
}
DataSet ds = new DataSet("Employees");
SqlConnection con = new SqlConnection("Password=admin;User ID=admin;Initial Catalog=asptest;Data Source=dbsvr");
SqlDataAdapter da = new SqlDataAdapter(query, con);
da.Fill(ds);
gvSession.DataSource = ds;
gvSession.DataBind();
}
Now I'm able to save search, so that problem is resolved ,but another has poped up that when I click the button search after changin text it takes me back to the older search..The reason is probably because sessions are not cleared,but I did that as well by handling textchanged and selectedindexchanged eventd.
Rather than trying to call your button click handler from the Page_Load, change your button click handler to simply call another method like:
protected void btnSearch_Click(object sender, EventArgs e)
{
RunSearch();
}
Then move all your btnSearch_Click() code into RunSearch()
Then in your Page_Load you can do something like:
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Gender"] != null && Session["FirstName"] != null)
{
txtSearch.Text = Session["FirstName"].ToString();
ddlGen.SelectedValue = Session["Gender"].ToString();
RunSearch();
}
if (!Page.IsPostBack)
{
BindGrid();
}
}
On a side note, I would recommend taking a look into SQLCommand Parameters. Your code is prone to SQL Injection Attacks:
http://en.wikipedia.org/wiki/SQL_injection
You should reset the session redirected variable so it doesn't fall in the same case.
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Redirected"] != null)
{
Session["Redirected"] = null;
....
You can do using an QueryString paremeter when page return back to main page then here you can check QueryString paremeter is exist. here you can implement code for bind grid
if (Request.QueryString["Back"]!= null)
{
// Your bind grid function
}
You can create a function, which will called both from the button_click and page_load.