CODEWITHSUNDEEP
asp.netdatabasegridview
yrazlik
yrazlik

Reputation: 10777

Gridview selected value always returns 0?

I am trying to delete a row from a gridview if "Web drop course" option is selected. Here is the UI:

enter image description here

And the code:

for (int i = 0; i < showCourses.Rows.Count; i++)
    {

        if (((DropDownList)showCourses.Rows[i].FindControl("actionmenu")).SelectedValue == "1")
        {
            dropList.Add(showCourses.Rows[i].Cells[2].Text +showCourses.Rows[i].Cells[3].Text );
        }
    }

Here is the dropdown list:

<asp:ListItem Selected="True" Value="0">No Action</asp:ListItem>
<asp:ListItem Value="1">Web Drop Course</asp:ListItem>

The problem is, ((DropDownList)showCourses.Rows[i].FindControl("actionmenu")).SelectedValue always returns 0 whether I choose No action or Web drop course. Can anyone see the problem?

Thanks

Upvotes: 0

Views: 294

Answers (2)

mshsayem
mshsayem

Reputation: 18018

Considering your previous post, you are rebinding the gridview on each postback. Wrap those lines with a !IsPostback conditional. Better wrap those into a method (say PopulateGrid()) and call it. Then, you can re-call that method in other situations where you might need to rebind the data (OnPageIndexChanged for example). Change your Page_Load method like this:

protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostBack)
    {
        PopulateGrid();
    }
}

private void PopulateGrid()
{
    using (SqlConnection con = new SqlConnection())
    {
        con.ConnectionString = Userfunctions.GetConnectionString();
        con.Open();
        string query = "select * from RegisterTable where StudentID='" + MyGlobals.currentID + "'";
        SqlDataAdapter adap = new SqlDataAdapter(query, con);
        DataTable tab = new DataTable();
        adap.Fill(tab);
        showCourses.DataSource = tab;
        showCourses.DataBind();     
    }
}

Upvotes: 1

ethorn10
ethorn10

Reputation: 1899

You are most likely not protecting against rebinding your data on postback. When your event that causes postback fires, the page load event fires before this. If you are binding in page load without a check for postback, you are basically resetting your data and then going into your event handler.

The page life cycle might be a good read: Page Life Cycle

Upvotes: 2

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