Assign value to gridview controls

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C

ASP.NET

I have a Grid in which 256 rows are there in which several columns are there like A,CH,Flat,PPP,D1-D16,DL.

This Grid in Placed In A User Control.

I Have An Another Page in Which that usercontrol is loaded & page includes a Master Page.

In The Page Load Event I have To Initialise & Populate Some Default Value That grid(which is in a usercontrol) in this Page(which includes a master page).

What I have tried:

for (int n = 0; n < 256; ++n)
{
Button btn_A1 = (Button)gvchannel.FindControl("btn_A1");
// Ch
if (cSiteData.stCh[n].EN)
//dataGridViewCh.Rows[n].Cells["Attached"].Value = "A";
//GridViewRow gvrowchannel=(GridViewRow)gvchannel.FindControl
{
//gvchannel.Rows[n].Cells[0].Text = "A";

btn_A1.Text = "A";
}
else
//dataGridViewCh.Rows[n].Cells["Attached"].Value = "";
//gvchannel.Rows[n].Cells[0].Text = "";
btn_A1.Text = "";

//dataGridViewCh.Rows[n].Cells["Channel"].Value = n + 1;
gvchannel.Rows[n].Cells[1].Text = Convert.ToString(n + 1);
//dataGridViewCh.Rows[n].Cells["Flat"].Value = cSiteData.stCh[n].flat;
gvchannel.Rows[n].Cells[2].Text = cSiteData.stCh[n].flat.ToString();
//dataGridViewCh.Rows[n].Cells["PPP"].Value = cSiteData.stCh[n].ppp;
gvchannel.Rows[n].Cells[3].Text = cSiteData.stCh[n].ppp.ToString();
}