Hi Prabha,
Please have a look into the following code snippet which works fine at my end and take a look into the attached screenshots.
ASPX:
<
asp:TextBox
ID
=
"TextBox1"
runat
=
"server"
>
</
asp:TextBox
>
<
asp:RequiredFieldValidator
ID
=
"RequiredFieldValidator2"
ValidationGroup
=
"Group1"
runat
=
"server"
Display
=
"None"
ErrorMessage
=
"TextBox is a required dield."
ControlToValidate
=
"TextBox1"
>
</
asp:RequiredFieldValidator
>
<
uc1:DropTree
ID
=
"DropTree1"
runat
=
"server"
/>
<
asp:RequiredFieldValidator
ID
=
"RequiredFieldValidator1"
ValidationGroup
=
"Group1"
runat
=
"server"
Display
=
"None"
ErrorMessage
=
"DropDown is a required field."
ControlToValidate
=
"DropTree1"
>
</
asp:RequiredFieldValidator
>
<
asp:ValidationSummary
ID
=
"ValidationSummary1"
runat
=
"server"
ValidationGroup
=
"Group1"
DisplayMode
=
"BulletList"
ShowMessageBox
=
"true"
HeaderText
=
"Please notice that:"
/>
<
asp:Button
ID
=
"btnSubmit"
runat
=
"server"
Text
=
"Submit"
OnClick
=
"btnSubmit_Click"
/>
Thanks,
Shinu.