.ASP C# Update button the forward to the next page


I have created an update button on a new page from a Data Navigate URL Fomatting string. which is the following "AccNum.aspx?AccNum={0}" and I've come from page "Default.aspx"

In the programming "onclick" the update sends a SQL query and then the page is blank after completion.
But I want the update got to go back to the previous page. How is this possible?

I have attached the current code for the button

protected void UpdateButton_Click(object sender, EventArgs e)
 String updateSQL;
 updateSQL = "UPDATE..."        
 AccessDataSource1.SelectCommand = updateSQL;

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response.redirect(String.Format(""AccNum.aspx?AccNum={0}"", variable));  ?

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