I have a ListBox in my webpage that is bound from database in this way:
ListBox1.DataTextField = "Text";
ListBox1.DataValueField = "MenuID";
ListBox1.DataSource = SqlHelper.ExecuteReader(DAL.DALBase.ConnectionString, "GetMenu");
ListBox1.DataBind();
I want to get selected item value and used this code but have a error and does not worked.
ListBox1.SelectedValue;
Forgive me if I have problems on how to write because my English is not good.
Can you be more specific on the error you are getting?
Using ListBox1.SelectedValue should work.
For example:
int mySelectedValue = int.Parse(ListBox1.SelectedValue);
or
string mySelectedValue = ListBox1.SelectedValue;
Edit
Added code to ensure the original poster was keeping values in ListBox databound.
protected void Page_Load( object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
BindListBox();
}
}
private BindListBox()
{
ListBox1.DataTextField = "Text";
ListBox1.DataValueField = "MenuID";
ListBox1.DataSource = SqlHelper.ExecuteReader(DAL.DALBase.ConnectionString, "GetMenu");
ListBox1.DataBind();
}
protected void SomeButton_Click( object sender, EventArgs e)
{
string mySelectedValue = ListBox1.SelectedValue;
}
Related
I have my website running on dotnetnuke 7.4, i have a checklistbox which i bind on the page load, and after selecting items from it, user clicks on the submit button, the selected items should save in database, however when i click on the submit button, checklistbox gets blank, i tried to enable ViewState at :
Web.config level
Page Level
Control Level
But all in vain, it still unbinds checklistbox because of which everything disappears, i tried the same in plain .net and it works like a charm.
Is there any specific settings in dotnetnuke to support viewstate, or is there any other better option to achieve this.
Here's my code:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Entities objEntities = new Entities();
List<Entities> obj = objEntities.GetList(2);
chkBox.DataSource = obj;
chkBox.DataTextField = "Name";
chkBox.DataValueField = "ID";
chkBox.DataBind();
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
foreach (ListItem item in chkBox.Items)
Response.Write(item.Text + "<br />");
}
There's the issue. Remove that (!IsPostBack) check in your page_load event. Have your code to be like below. Else, only at first page load you are binding the datasource to control which gets lost in postback.
protected void Page_Load(object sender, EventArgs e)
{
Entities objEntities = new Entities();
List<Entities> obj = objEntities.GetList(2);
chkBox.DataSource = obj;
chkBox.DataTextField = "Name";
chkBox.DataValueField = "ID";
chkBox.DataBind();
}
OR, to be more efficient; refactor your code to a method like below and store the data object in Session variable like
private void GetDataSource()
{
List<Entities> obj = null;
if(Session["data"] != null)
{
obj = Session["data"] as List<Entities>;
}
else
{
Entities objEntities = new Entities();
obj = objEntities.GetList(2);
}
chkBox.DataSource = obj;
chkBox.DataTextField = "Name";
chkBox.DataValueField = "ID";
chkBox.DataBind();
Session["data"] = obj;
}
Call the method in your Page_Load event like
protected void Page_Load(object sender, EventArgs e)
{
GetDataSource();
}
I designed a report with stimul. In this report there's two types of filters. First one for filtering Date via two text box and other one for filtering class type via dropdown.
Both of them work correctly in stimulsoft designer but dropdown filtering doesn't work in asp.net web page.
http://8pic.ir/images/0klmctx0poxzfud6pjy0.png
public partial class Report : System.Web.UI.Page
{
EsmailEntities db = new EsmailEntities();
protected void Page_Load(object sender, EventArgs e)
{
DrpGrpPro();
}
protected void Button1_Click(object sender, EventArgs e)
{
string con = ConfigurationManager.ConnectionStrings["EsmailEntities"].ConnectionString;
string serverlocation = HttpContext.Current.Server.MapPath(string.Empty);
StiReport report = new StiReport();
report.Dictionary.Databases.Add(new Stimulsoft.Report.Dictionary.StiSqlDatabase("connection", con));
report.Load(serverlocation + "\\Reports\\ReportWithFiltermrt.mrt");
report.Dictionary.Variables["SC"].Value = DropDownList1.SelectedItem.Value;
report.Dictionary.Variables["FromDate"].Value = txtFromDate.Text;
report.Dictionary.Variables["ToDate"].Value = txtToData.Text;
}
void DrpGrpPro()
{
DropDownList1.DataTextField = "ClassName";
DropDownList1.DataValueField = "ClassId";
DropDownList1.DataSource = db.TblClass.ToList();
DropDownList1.DataBind();
DropDownList1.Items.Insert(0, new ListItem("انتخاب کنید", "0"));
}
}
I have dropdownlist on my website. When I select the any item to insert the database but it does not insert selected item always insert the first item inside the dropdown list. Please Help How can I solve that problem?
Here is my code:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
GetCategory();
}
}
void GetCategory()
{
dlCategory.DataSource = Data.GetDataTable("SELECT * FROM tblCategory");
dlCategory.DataTextField = "CategoryName";
dlCategory.DataValueField = "ID";
dlCategory.DataBind();
dlCategory.Items.Insert(0, new ListItem("--Select--", "0"));
dlCategory.SelectedIndex = dlCategory.Items.IndexOf(dlCategory.Items.FindByText("--Select--"));
}
SqlConnection baglanti = Data.baglan();
SqlCommand tr = new SqlCommand("Insert tblProduct (CategoryID) values(#CategoryID)", baglanti);
tr.Parameters.AddWithValue("#CategoryID", dlCategory.SelectedValue);
tr.ExecuteNonQuery();
Your question is a bit blurry regarding the code, so correct me if I misunderstood, but I presume you want to do the following in WebForms:
Simply show all available categories that can be assigned to a
product
When the user selects the category and hits submit, it will be inserted to the DB assegnied to it
It is not quite elegant, but I would put something like this:
private SqlConnection _sqlConnection = new SqlConnection();
protected void Page_Load(object sender, EventArgs e)
{
_sqlConnection.ConnectionString = #".." //Assign whatever your ConnectionString is in Data.baglan();
_sqlConnection.Open();
if (!IsPostBack)
{
GetCategory();
}
else
{
//Define your insert something like this, and I would put this into the submit Button_Click event:
if (!String.IsNullOrEmpty(dlCategory.SelectedValue) && dlCategory.SelectedValue != "0")
{
SqlCommand tr = new SqlCommand("Insert tblProduct (CategoryID) values (#CategoryID)", _sqlConnection);
tr.Parameters.AddWithValue("#CategoryID", dlCategory.SelectedValue);
tr.ExecuteNonQuery();
}
else
{
//TODO: Handle wrong selection, eg display an error message..
}
}
}
void GetCategory()
{
dlCategory.DataSource = new SqlCommand("SELECT * FROM tblCategory", _sqlConnection).ExecuteReader();
dlCategory.DataTextField = "CategoryName";
dlCategory.DataValueField = "ID";
dlCategory.DataBind();
dlCategory.Items.Insert(0, new ListItem("--Select--", "0"));
dlCategory.SelectedIndex = dlCategory.Items.IndexOf(dlCategory.Items.FindByText("--Select--"));
}
After several searches on the Internet finally decided to drop a question.
At runtime I want the following to happen.
If you push a button a textbox will be added to the controls and a custom validator must be attached to the textbox and fire.
It does not fire. Why?
Here is my code
Thank you for looking into this.
public partial class WebUserControl1 : System.Web.UI.UserControl
{
CustomValidator rv2 = new CustomValidator();
protected void Page_Init(object sender, EventArgs e)
{
if (!IsPostBack)
{
rv2.ID = "rev2";
rv2.ErrorMessage = "Not numeric input";
rv2.ClientValidationFunction = "";
rv2.ServerValidate += new ServerValidateEventHandler(GetalValidator);
Controls.Add(rv2);
}
}
protected void ButtonClick(object sender, EventArgs args)
{
TextBox tb1 = new TextBox();
tb1.ID = "tb2";
tb1.Visible = true;
tb1.Width = 30;
this.Controls.Add(tb1);`enter code here`
rv2.EnableClientScript = false;
rv2.ControlToValidate = "tb2";
}
private bool IsNumber(string someText)
{
int number;
bool result = Int32.TryParse(someText, out number);
return result;
}
protected void GetalValidator(object source, ServerValidateEventArgs args)
{
args.IsValid = IsNumber(args.Value);
}
}
here is part of code thorugh which you can add validation on your dynamically created control.
TextBox tb1 = new TextBox();
tb1.ID = "tb2";
tb1.Visible = true;
tb1.Width = 30;
RequiredFieldValidator regfv = new RequiredFieldValidator();
regfv.ID = "regfv";
regfv.ControlToValidate = tb1.ID;
regfv.ErrorMessage = "My Error";
this.Controls.Add(tb1);
this.Controls.Add(regfv);
I have database with images in folder on my server. To display this images I'am using DataList control. ItemTemplate include also a LinkButton
<asp:LinkButton ID="wybierzZdjecieBtn" OnClick="choosePhotoButton_Click" CommandArgument='<%#Eval("PhotoLinkAddress")%>' CssClass="wybierzZdjecieButton" runat="server">Choose photo</asp:LinkButton>
To receiving Value from LinkButton CommandArgument i'am using this method:
protected void choosePhotoButton_Click(object sender, EventArgs e)
{
LinkButton button = (LinkButton)(sender);
string photoLinkAddressVar = button.CommandArgument.ToString();
Response.Write(PhotoLinkAddressVar);
}
This works fine, no problems. But this is not what I want achieve. My intentions is send this variable "PhotoLinkAddressVar" to this method:
protected void addNewNews_Click(object sender, EventArgs e)
{
string trescStatus = "czeka";
string autor = Session["userName"].ToString();
DateTime data = DateTime.Now;
string dataFormat = "";
dataFormat = data.ToString("dd/MM/yyyy H:mm");
string CS = ConfigurationManager.ConnectionStrings["wiadomosciConnection"].ConnectionString;
using (SqlConnection con = new SqlConnection(CS))
{
con.Open();
string dodaj = "Insert into News (TytulNews, TrescNews, Autor, Data, Kategoria, Dotyczy, PhotoLinkAddress, Status) values (#TytulNews, #TrescNews, #Autor, #Data, #Kategoria, #Dotyczy, #PhotoLinkAddress, #Status)";
SqlCommand com = new SqlCommand(dodaj, con);
com.Parameters.AddWithValue("#TytulNews", tytulNewsTextBox.Text);
com.Parameters.AddWithValue("#TrescNews", trescTextBox.Text);
com.Parameters.AddWithValue("#Autor", autor);
com.Parameters.AddWithValue("#Data", dataFormat);
com.Parameters.AddWithValue("#Kategoria", kategoria.SelectedValue.ToString());
com.Parameters.AddWithValue("#Dotyczy", dotyczy.SelectedValue.ToString());
com.Parameters.AddWithValue("#PhotoLinkAddress", photoLinkAddressVar);
com.Parameters.AddWithValue("#Status", trescStatus);
com.ExecuteNonQuery();
}
}
User have to choose photo before press "Add News", because if He doesn't do that, he will receive error message. I dont know, how do that. I Was trying declare some kind public variable before PageLoad and do something like this:
protected void choosePhotoButtonButton_Click(object sender, EventArgs e)
{
LinkButton button = (LinkButton)(sender);
photoLinkAddressVar = button.CommandArgument.ToString();
}
but that method won't declare the variable. Do You have any idea, how can I achieve that ?.
You could use also the ViewState.
protected void choosePhotoButton_Click(object sender, EventArgs e)
{
LinkButton button = (LinkButton)(sender);
string photoLinkAddressVar = button.CommandArgument.ToString();
View["photoLinkAddressVar"]=photoLinkAddressVar;
Response.Write(PhotoLinkAddressVar);
}
Then in the addNewNews_Click method, you coukld retrieve this value with the following way:
com.Parameters.AddWithValue("#PhotoLinkAddress", ViewState["photoLinkAddressVar"]);
For further documantation about ViewState please look here.