validation on textbox (no space)

Question

i have a webpage in that i have a text box, my requirement is i don't want to give space in the textbox if user give space in textbox it give indication no space in the textbox

Answer 1

If you intended to capture a value where spaces aren't a valid character, you could use a RegularExpressionValidator:

<asp:RegularExpressionValidator ID="rev" runat="server" ControlToValidate="txtBox"
    ErrorMessage="Spaces are not allowed!" ValidationExpression="[^\s]+" />
<asp:RequiredFieldValidator ID="rfv" runat="server" ControlToValidate="txtBox" 
    ErrorMessage="Value can't be empty" />

This would prevent "hello world" and "data base" since they contain spaces, and would only allow "helloworld" and "database" as valid values. You must use a RequiredFieldValidator in conjunction with it to prevent blank entries since the RegularExpressionValidator does not prevent that on its own.

Specify the name of the textbox in the ControlToValidate property.