Error - Object reference not set to an instance of the Object

Question

User-1499457942 posted

Hi

  I have below code . ON below line it is giving above error . There are 2 records in dt

lst.DataSource = dt;

using (SqlConnection con = new SqlConnection(CommonFunction.connectionString))
            {
                SqlCommand cmd = new SqlCommand("Select Location from [Loc]", con);
                cmd.CommandType = CommandType.Text;
                con.Open();
                SqlDataAdapter sda = new SqlDataAdapter(cmd);

                DataTable dt = new DataTable();
                sda.Fill(dt);
                if (dt.Rows.Count > 0)
                {
                    CheckBoxList lst = (CheckBoxList)e.Row.FindControl("ChekcBoxList1");
                    lst.DataSource = dt;
                    lst.DataBind();
                }
            }

Thanks

Answer 1

User-82109136 posted

The following line is returning null

CheckBoxList lst = (CheckBoxList)e.Row.FindControl("ChekcBoxList1");

The F12 browser tools may be helpful in this case to find the correct ID to be used.

Answer 2

User-492460945 posted

Hi Jagjit,

It seems there is something wrong in the below line. Are you sure you have a checkbox control with id as "ChekcBoxList1"?

CheckBoxList lst = (CheckBoxList)e.Row.FindControl("ChekcBoxList1");

Answer 3

User-82109136 posted

Looks like a misspelling:

ChekcBoxList1

should be

CheckBoxList1

Answer 4

User-1171043462 posted

1. Always share Full function or event.
2.  Share HTML