how to do paging in asp .net data controls

Hi,
I am facing a painful problem using DatePicker in DataGrid. The problem is the when I am clicking the date in the popped up calender, the date is getting greyed but the date value is not getting into the datagrid textbox. The code is given below:

<EditItemTemplate>
<Asp:TextBox ID="txtHelpDeskRequestDate" Text='<%# DataBinder.Eval(Container.DataItem, "HelpDeskCallDate" ) %>' runat="server" Width="70px" ReadOnly="false">
</Asp:TextBox>&nbsp;&nbsp;
<a href="javascript:;" onclick="calendarPicker('form1.txtHelpDeskRequestD ate');" title="Pick Date from Calendar"><img src="/cal.gif" width="16" height="16" border="0" alt="Click Here to Pick up the timestamp" align = "left">
</a>
</EditItemTemplate>


The function is like this:
function calendarPicker(strField)
{
window.open('/DatePicker.aspx?field=' + strField,'calendarPopup','width=250,height=190,res izable=yes');
}

Please Help

One of the most powerful server controls in ASP.NET is no doubt the DataGrid control. The DataGrid control is a multi-column, data-bound ASP.

ASP.NET pages, known officially as "web forms", are the main building block for application development.
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How do you pass a variable by value?
Just like in C++, put an ampersand in front of it, like $a = &$b

there is no specific data validation for the same. when the cell is clicked you will have to use the text box and in it u will have to implement the validation control for the same. or else while entering the value u will know which columns have to be numeric or alphabetic. depending on it you will call the specific function for the same.