I'm having trouble setting default column width.

protected void Page_Load(object sender, EventArgs e)

 -- getting dataset from database here.

WebDataGrid1.DataBind();

WebDataGrid1.Columns[1].Width = 150;  //this is my attempt to setting default column width

}

I am getting "Object reference not set to an instance of an object" error. I can only set default column if I have data source defined at design time. Can someone help me figure out how I can set the default column width?

Thank you in advance for all your help.