Script On Button Click

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protected void btnScript_Click(object sender, EventArgs e)
       {
           if (txtdata.Text != "")
           {
               const string script = "alert('You have e')";
               ClientScript.RegisterClientScriptBlock(GetType(), "alert", script, true);
           }
           else
           {
               const string script = "alert('Please enter some data')";
               ClientScript.RegisterClientScriptBlock(GetType(), "alert", script, true);
           }
       }