Get value of CheckBox in GridView, Bit Datatype, asp.net

Question

I am beginner and question or syntax may be silly.
I have drawn a grid view having based on a SqlDataSource query.
Converted a status field into Bit.
a checkbox is automatically created.

now how can i get the value of checkbox on SelectedIndexChanged.

        protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        Panel_Entry.Visible = true;
        int i = GridView1.SelectedIndex;
        String vDescr = GridView1.Rows[i].Cells[2].Text;
        CheckBox chk = (CheckBox)GridView1.Rows[i].FindControl("BitStatus");
        Response.Write(chk.ToString()+vDescr);}

System.NullReferenceException: Object reference not set to an instance of an object.

error is shown. please help in this regard.

Line 68: Response.Write(chk.ToString()+vDescr); Line 69: Line 70: — classic classic, May 08 '13 at 17:20
The error raises just when you reach one of these lines, on which of them it raises? 66 or 67 or .....? I think it should be raised on line 67 ? — Maryam Arshi, May 08 '13 at 17:23
yes i think it is because ... once we want to try to print the value or apply some if condition, it gives error — classic classic, May 08 '13 at 17:28

score 1 · Answer 1 · edited May 23 '17 at 10:25

1

when you add a control dynamically , you should load the control again and it will not list in control tree.for finding it you can use a loop to find it like it is said in this post Better way to find control in ASP.NET

Also look at this post too: it seems useful ASP.Net FindControl is not working - How come?

edited May 23 '17 at 10:25

Community

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answered May 08 '13 at 17:39

Maryam Arshi

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classic classic · Accepted Answer · 2013-05-08T17:52:42.640

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thanks everybody...I have found the solution.

CheckBox chk = (CheckBox)GridView1.Rows[i].Cells[3].Controls[0]; if (chk.Checked) { Response.Write("yes"); } else { Response.Write("no"); } it is working fine. findcontrol() works if we are using some asp:template itemtemplate etc.

edited May 08 '13 at 17:52

answered May 08 '13 at 17:45

classic classic

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Get value of CheckBox in GridView, Bit Datatype, asp.net

System.NullReferenceException: Object reference not set to an instance of an object.

2 Answers2