Pass Selected Value To Query String

Source.aspx.cs:
Two Radio Buttons (RD1 & RD2) AND One Submit Button
 
protected void btnsubmit_Click(object sender, EventArgs e)
    {
            Response.Redirect("MyReports.aspx?value="+RD1.Text);              
    }
 
Target.aspx.cs:
 
Get The Value of RD1 Only .if >> MyReports.aspx?value="+RD1.Text from Source.aspx
 
Get The Value of RD2 Only. if >> MyReports.aspx?value="+RD2.Text from Source.aspx
 
 
I Want, If a common concatenation Is Defined SO THAT, if RD1 is selected, Value of RD1 is Passed To Target Page. If RD2 is Checked, Than value of RD2 is passed on Target Page.
HOW It will be DONE.
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