Solved: C#7 | Experts Exchange

Is there an error at the submit function? Can you help me please?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Paycheck</title>
</head>
<body>
<script runat="server" >
void Text1_onclick(object sender, EventArgs e)
{

}
void Text1_onclick(object sender, EventArgs e)
{
}
void Submit1_onclick(object sender, EventArgs e) {
if (Text1.Value.Length < 1)
{
string error = "Please Enter a value in Hours Field ";
string script = "alert(\"" + error + "\");";
ClientScript.RegisterClientScriptBlock(this.GetType(), "myScript", script , true);

}
else if(Text2.Value.Length < 1)
{
string error = "Please Enter a value in Pay Rate Field";
string script = "alert(\"" + error + "\");";
ClientScript.RegisterClientScriptBlock(this.GetType(), "myScript", script , true);

}
else
{
string error = Convert.ToDouble(Text1.Value);
string error = Convert.ToDouble(Text2.Value);
string script = "alert(\"" + "\");";
ClientScript.RegisterClientScriptBlock(this.GetType(), "myScript", script, true,
"Your Gross Pay is $ {0}" ,hours - 40 * rate * 1.5);
}
}
</script>
<form action="Default.aspx" method="post" runat="server">
<p>Enter Hours Worked:<input id="Text1" type="text" onServerClick="Text1_onClick" runat="server" /></p>
<p>Enter Pay Rate:<input id="Text2" type="text" onServerClick="Text2_onClick" runat="server" /></p>
<p><input id="Submit1" type="submit" value="submit" onServerClick="Submit1_onclick" runat="server" /></p>
</form>
</body>
</html>