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Calculate Sum on aspx page, then insert figure on aspx.vb page

DueFrom asked
Last Modified: 2012-05-11
function fnCalculateSum()
var result = 0;
result = result + parseInt(document.getElementById("<%=Textbox1.ClientID%>").value);
result = result + parseInt(document.getElementById("<%=Textbox2.ClientID%>").value);

document.getElementById("<%=Textbox9.ClientID%>").value = result;


I am using above code in my aspx page to sum textbox1 and textbox2 and show the calculated sum in textbox9.  But on aspx.vb page, if i try to do a insert into sqldatabase the TextBox9.Text  is empty here.   I must be missing something that brings the value from 1st page into code behind.  

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