Gridview with C# adding rows

Question

I want to add a row to my gridview. i succeeded in adding text boxes, but i cannot extract the value It keeps telling me that object reference not set to an instance of an object. At this line it halts

string acc = Convert.ToString(((TextBox)GridView1.FooterRow.FindControl("accountID")).Text);

Please what am i doing wrong

You don't need to convert a string to a string(TextBox.Text returns already a string). How and where have you added the TextBox to the footer-row? — Tim Schmelter
– Tim Schmelter, Commented Nov 26, 2012 at 15:41
i added the textBox to the footer row in the method below protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) — mayowa ogundele
– mayowa ogundele, Commented Nov 26, 2012 at 15:46

Tim Schmelter · Accepted Answer · 2012-11-26 15:55:38Z

1

You don't need to convert a string to a string(TextBox.Text returns already a string).

How and where have you added the TextBox to the footer-row?

i added the TextBox to the footer row in GridView1_RowDataBound

RowDataBound isn't the right method for dynamic controls since it is called only on databinding and not on every postback. But dynamical controls need to be recreated on every postback.

So use RowCreated instead to create controls dynamically and use RowDataBound to databind them.

protected void GridView1_RowCreated(Object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.Footer)
    {
        TextBox tb = new TextBox();
        tb.ID = "accountID";
        e.Row.Cells[indexOfColumn].Controls.Add(tb);
    }
}

edited Nov 26, 2012 at 15:55

answered Nov 26, 2012 at 15:49

Tim Schmelter

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2 Comments

mayowa ogundele Over a year ago

so how do i use rowcreated. First to bind the textboxes that allows the user to enter the new data, secondly to capture data entered by the user into a database

Tim Schmelter Over a year ago

@mayowaogundele: Edited my answer to privide an example. Note that indexOfColumn is the index of the column where you want to add the TextBox.

sajanyamaha · Accepted Answer · 2012-11-26 16:08:55Z

0

Ok first check wether its a footer row ,then find the textBox in it

protected void grdAccounts_RowDataBound(object sender, GridViewRowEventArgs e)
{
  if (e.Row.RowType == DataControlRowType.Footer)
  {
   //get text box value here
  }
}

In Button Click

try this

GridViewRow row = GridView1.FooterRow; 
firstName = ((TextBox)row.FindControl("TextBox1")).Text;

edited Nov 26, 2012 at 16:08

answered Nov 26, 2012 at 15:56

sajanyamaha

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2 Comments

mayowa ogundele Over a year ago

but i think i am supposed to retrieve the content of the text on button click. So put the above code in _RowCommand and i was having errors

mayowa ogundele Over a year ago

it still gives NullReferenceException after the textbox has been filled

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