Validation By Control ASP.Net

  1. Home
  2. ASP.Net
  3. Validation By Control
  4. Asp CustomValidator
<%@ Page Language="C#" %>

    void valProductCode_ServerValidate(Object source, ServerValidateEventArgs args)
    {
        if (args.Value.Length == 4)
            args.IsValid = true;
        else
            args.IsValid = false;
    }



    Show Validate Empty Text


    
    

    
            id="lblProductCode"
        Text="Product Code:"
        AssociatedControlID="txtProductCode"
        Runat="server" />
    
            id="txtProductCode"
        Runat="server" />
            id="valProductCode"
        ControlToValidate="txtProductCode"
        Text="(Invalid product code)"
        ValidateEmptyText="true"
        OnServerValidate="valProductCode_ServerValidate" 
        Runat="server" />
    
    
    
            id="btnSubmit"
        Text="Submit"
        Runat="server" />