How to determine if asp.net validate control has reported an error?

I have a basic ASP.NET C# web application.  Each control is paired with a validator control and the errors are displayed to the user via "validation summary" control. The Web page has a next button to go to another aspx page.  How do I check in the code behind the Next button if errors exist and not go to the next page?
MSDN shows the ValidatorSummary has a "HasErrors" property.  However, this is not a valid property.

on NEXT button
if no errors go to next page
otherwise redisplay the current page.

thanks
wilfordrocksAsked:
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Lalit ChandraConnect With a Mentor Commented:
ASP.NET 2.0 validator control render a javascript file in which there is a function
ValidatorValidate(validatorcontrolid).
It is this function that actualy gets fired for each validator control on the clientside.
So, on the client side i.e in javascript you can explicitly call this function to validate forcely.
And at the server side, you have to use
Page.IsValid property as suggested by VictorTarasov.

Hope this will make you clear idea about the asp.net Validation at client side.
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Victor TarasovConnect With a Mentor Head of the Department of System AdministrationCommented:
Use Page.IsValid
Read
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TonyRebaConnect With a Mentor Commented:
Well , if you are using the asp validation controls, it should not go to next page, unless you the validation arguments are valid....



As Victor Suggested you can also do;

   protected void btnSubmit_Click(object sender, EventArgs e)
    {
        // If Page is Valid          
        if (Page.IsValid )
        {  

            // Redirect Page 2

           Response.Redirect("Page2.aspx");
        }

    }
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