Bind and access checkbox value within a gridview

Question

In my grid view I've a checkbox column, and am binding the gridview with a dictionary. I need to get the corresponding Id from the checked boxes.

In my dictionary I've the key values like

Id         Name
--         ----
 1         Arts
 2         Science
 3         Engineering

Here, I tried to bind the value for this checkbox as

<asp:TemplateField>
    <ItemTemplate>
      <asp:CheckBox ID="chkSelItem" value="<%# Eval("Key.Id") %>" 
                                                       runat="server" />
    </ItemTemplate>
</asp:TemplateField>

<asp:TemplateField HeaderText="Department">
    <ItemTemplate>
         <%# Eval("Key.Name") %>
    </ItemTemplate>
    <HeaderStyle HorizontalAlign="Left" />
</asp:TemplateField>

and from the codebehind, I tried like

foreach (GridViewRow row in gridDepartments.Rows)
        {
            CheckBox chkSelItem = (CheckBox)row.FindControl("chkSelItem");

            if (chkSelItem.Checked)
            {
                int departmentId = int.Parse(chkSelItem.Text);
                ////
                ////                 
            }
        }

its throwing error, or not showing any value for the checkbox.

I also trid with FindControl, but no use of it, coz in the key & Value pair am using a class(which inherits another class) and a bool. thats what am trying like this, can anyone help me here, thanks in advance.....

I have a delete button above the gridview, when I select more than one checkboxes and clicking on the delete button, I've to get the corresponding Ids and delete the values from the database — shanish
– shanish, Commented Jun 22, 2012 at 6:23

Vaibhav · Accepted Answer · 2012-06-22 06:32:44Z

1

You can try this one...

Bind id to lable instead of to checkbox as below.

<asp:TemplateField>     
<ItemTemplate>       
<asp:CheckBox ID="chkSelItem" runat="server" />     

<asp:Label ID="lblSelectedItem" value=<%# Eval("Key.Id")) %> visible="False"/>
</ItemTemplate> </asp:TemplateField>



In codebehind try this

foreach (GridViewRow row in gridDepartments.Rows)         
{             
      CheckBox chkSelItem = (CheckBox)row.FindControl("chkSelItem");
       Label lblSelectedItem= (Label)row.FindControl("lblSelectedItem");

      if (chkSelItem.Checked) 
      {
                 int departmentId = int.Parse(lblSelectedItem.Text); 
      }
} 



Hope this is what u want...

answered Jun 22, 2012 at 6:32

Vaibhav

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1 Comment

shanish Over a year ago

ya its a nice idea, binding the Text value works like a charm, I can get the Id also, I was thinking how to hide the Text value, u've given such a nice idea, I'll try it and let u know

Rab Khan · Accepted Answer · 2012-06-22 06:15:20Z

1

Use

CheckBox chkSelItem = (CheckBox)row.cell[0].FindControl("chkSelItem");// Replace row.cell[0] accrding to you celll index

instead of

 CheckBox chkSelItem = (CheckBox)row.FindControl("chkSelItem");

answered Jun 22, 2012 at 6:15

Rab Khan

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Comments

Ebad Masood · Accepted Answer · 2012-06-22 06:29:26Z

1

In Aspx page:

<asp:CheckBox ID="chkSelItem" Text="<%# Eval("Key.Id") %>" runat="server" />

In code-behind add a check to ensure the item is not null:

    CheckBox chkSelItem = (CheckBox)row.FindControl("chkSelItem");

    if (chkSelItem != null && chkSelItem.Checked && !string.IsNullOrEmpty(chkSelItem.Text))
    {

        int departmentId = int.Parse(chkSelItem.Text);                
    }

answered Jun 22, 2012 at 6:29

Ebad Masood

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Comments

Adil · Accepted Answer · 2012-06-22 06:48:35Z

1

I think you have to use Text instead of value as you are assigning to value and getting text property. Text will be empty string and parsing it with int throws exception.

int.Parse(chkSelItem.Text);

<asp:CheckBox ID="chkSelItem" value="<%# Eval("Key.Id") %>" runat="server" />

Would be

<asp:CheckBox ID="chkSelItem" Text="<%# Eval("Key.Id") %>" runat="server" />

Or

If you have to use Value of check box, then access value not Text

<asp:CheckBox ID="chkSelItem" value="<%# Eval("Key.Id") %>" runat="server" />

int departmentId = int.Parse(chkSelItem.Attributes["value"].ToString());

edited Jun 22, 2012 at 6:48

answered Jun 22, 2012 at 6:17

Adil

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4 Comments

shanish Over a year ago

its working Adil, but I need to hide the Text value, wait am working on that as per SimplyVaibh's solution, I'll let u know once its done

Adil Over a year ago

You are welcome you can get value by chkSelItem .Attributes["value"].ToString();

Adil Over a year ago

Update my answer, this can get the value of checkbox.

shanish Over a year ago

thanks Adil, for ur kind response, am in great confusion to which answer I've to mark as accepted

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