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Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Object referen

Posted By:      Posted Date: September 30, 2010    Points: 0   Category :ASP.Net
 

Hi,

 i have a dropdownlist and Datagrid control on form. i wanted to refresh the grid

on changing  the DropDown OnSelectedIndexChanged, but when i do change

the dropdown value then it give me fallowing error message.

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Object reference not set to an instance of an object.

Can any one help me, how to solve this problem?

Code given below.

<table>

<tr>
            <td>
                <asp:DropDownList ID="ddColor" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddColor_SelectedIndexChanged"
                    Width="100px">
                    <asp:ListItem Selected="True">Red</asp:ListItem>
                    <asp:ListItem>Blue</asp:ListItem>
   &n


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