Data Gridview: how do Auto increment cell value

if your application in Windows based follow the code

public void AutoNumberRowsForGridView(DataGridView dataGridView)
{
  if (dataGridView != null)
  {
     for (int count = 0;(count <= (dataGridView.Rows.Count - 2)); count++)
     {
         dataGridView.Rows[count].HeaderCell.Value = string.Format((count + 1).ToString(), "0");
     }
  }
}

if it is webbased then follow following code
add Tempate field and itemTempalte in gridview and then assign value to column.

<asp:TemplateField HeaderText="S.No." ItemStyle-HorizontalAlign="Center">
<ItemTemplate>
<%#Container.DataItemIndex+1%>
</ItemTemplate>
</asp:TemplateField>

Try the following links:

How to : Add an autonumber column in a DataGridView
auto generate row number to datagridview in windows application
Automatically Adding Numbers to the Rows in a DataGridView

Hope it helps you..

Label1.Text = "Columns with AutoIncrement Property in DataTable....<br />";  
        for (int i=0; i< dt.Columns.Count; i++)  
        {  
            Label1.Text += dt.Columns[i].ColumnName + " || ";  
            Label1.Text += dt.Columns[i].AutoIncrement + "";  
        }  
    }  

this code is, just an example pls go thru the link for further clarifications


Look at this blog u may get an idea..

AutoIncrement

<h1>asdfadsf </h1>

I found this solutions and works for me

<asp:TemplateField HeaderText="S.No." ItemStyle-HorizontalAlign="Center">
<ItemTemplate>
<![CDATA[<%#(Container.DataItemIndex + 1) + ((YourGridViewID.PageIndex) * (YourGridViewID.PageSize))%>]]>
</ItemTemplate>
</asp:TemplateField>