Question

i added checkboxes dynamically to panel.

for (int intControlIndex = 0; intControlIndex < dsTagsList.Tables[0].Rows.Count; intControlIndex++)
{
   chkList1 = new CheckBox();
   chkList1.Text = dsTagsList.Tables[0].Rows[intControlIndex][0].ToString();
   chkList1.ID = "Chk" + intControlIndex;
   chkList1.Font.Name = "Verdana";
   chkList1.Height = 20;
   chkList1.ForeColor = System.Drawing.Color.Black;
   chkList1.Font.Size = 10;
   panelTags.Controls.Add(chkList1);
   panelTags.Controls.Add(new LiteralControl("<br>"));
}

How to check which checkboxes selected or not ?
Please tell me….

Answer 1

I would loop through all controls in the panel, check if the control is a check box, then act on it if it is.

foreach(Control child in panelTags.Controls)
{
    if(!(child is CheckBox))
        continue;

    if((child as CheckBox).Checked)
    {
        // Do 'is checked' something
    }
    else
    {
        // Do 'is not checked' something
    }
}

Or better yet, using LINQ OfType that filters an enumerable by type:

foreach(CheckBox child in panelTags.Controls.OfType<CheckBox>())
{
    if(child.Checked)
    {
        // Do 'is checked' something
    }
    else
    {
        // Do 'is not checked' something
    }
}

The LINQ statement lets us further query the list.
If you only want to act on checked checkboxes.

// Add to Usings
using System.Linq;

foreach(CheckBox child in panelTags.Controls
                              .OfType<CheckBox>()
                              .Where(chk => chk.Checked))
{
    // Do 'is checked' something
}

A few other things I can think of that may be causing problems:

1. Is the foreach is being called before Page_Load? Since you’re likely running this in a postback, the Page_Load is when the control properties are loaded with information recovered from view state and control state.

2. Is the checkbox creation within a if(!IsPostBack) to prevent multiple controls from being added?

3. Are you calling panelTags.Controls.Clear(); before adding the checkboxes this will remove any data returned from the page>