Forms Data Controls :: Capturing Textbox And Dropdown Defined Inside Gridview?

My Problam is on Capturing Text Box and Dropdown seleted itam from grid view i create a gridview with Empty DB binding using [URL] this senirio. I only used setinitional value() function and called its in page load as discribed in above lonk. insted of adding New record Button i callled a java scrit code discribed below. and i also create a button (SAVE) to capture a value intered in text box . On this button click event i try to capture a textbox and dropdown value like

for (int i = 0; i < Gridview1.Rows.Count; i++)
{
DropDownList sen_to1 = (DropDownList)Gridview1.Rows[i].Cells[1].FindControl("DD_sento_org");
TextBox Add_to1 = (TextBox)Gridview1.Rows[i].Cells[2].FindControl("Txt_addto");
int Add_to = Convert.ToInt32(sen_to1.SelectedValue);
String Addd_to = Add_to1.Text;
}

but its not working i can not go inside loop.

<script
type='text/javascript'
language='javascript'>
function AddNewRecord(keyCode, obj)
{
if (window.event.keyCode==13 )var grd = document.getElementById('Gridview1');
var tbod=grd.rows[0].parentNode;
var newRow=grd.rows[grd.rows.length - 1].cloneNode(true);
cleanUpInputs(newRow);
tbod.appendChild(newRow);
}
}
return
false ;