Object reference not set to an instance of an object.

Question

i want to edit and update data in grid view but i get he following error.
Object reference not set to an instance of an object.

Line 74:         DTSample.Rows[e.RowIndex]["Column0"] = t1.Text;

the code the given below. please help me

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = Convert.ToInt32(e.NewEditIndex);
        HiddenField1.Value = e.NewEditIndex.ToString();
        GridView1.DataBind();
    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        TextBox t1 = new TextBox();
        TextBox t2 = new TextBox();
        t1 = (TextBox)GridView1.Rows[Convert.ToInt32(HiddenField1.Value)].Cells[2].Controls[0];
        t2 = (TextBox)GridView1.Rows[Convert.ToInt32(HiddenField1.Value)].Cells[3].Controls[0];
        DTSample.Rows[e.RowIndex]["roll"] = t1.Text;
        DTSample.Rows[e.RowIndex]["name"] = t2.Text;
        GridView1.EditIndex = -1;
        GridView1.DataBind();

    }

Vulpes · Answer

In that case, it would appear that there's no DataRow at position e.RowIndex in the DataTable because (apart from DTSample itself) there's nothing else that can be null. Could you have added some more rows to the GridView but not updated the DataTable?

Sam Hobbs · Answer

Also note that you can use the debugger to determine what is not valid. So using the debugger you could have seen that DTSample.Rows[e.RowIndex] was not valid.

saifullah khan · Answer

sir the column name is actually Column0

Vulpes · Answer

Do you actually have a column in your DataTable called Column0 or are you simply trying to access the first column in the DataRow? If it's the latter, then this should work if the row exists: DTSample.Rows[e.RowIndex][0] = t1.Text;

Object reference not set to an instance of an object.

Answers (4)