GridView In asp.net

Simply by setting pagesize property of the respective GridView. E.g. if you have a gridview with id as grdVw1 then you can set the page size in code behind as:

grdVw1.pagesize = 10;

you will need to rebind the gridview in order for this change to take place.

Try this:

GridView1.DataSource = MyDataSource; //This should be replaced with your datasource
GridView1.EnableViewState = true;
GridView1.AllowPaging = true;
GridView1.PageSize = 4;
GridView1.DataBind();

You can also fire PageIndexChanging event. E.g.:

GridView1.PageIndexChanging += new GridViewPageEventHandler(GridView1_PageIndexChanging);

Code to handle page index change event:

void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
   //Your code block
}

--Amit