get gridview cell data using javascript

Its very easy

on page load write this

foreach (GridViewRow row in GridView1.Rows)
{
               Button bk = (Button)row.FindControl("Button2");
               bk.Attributes.Add("onclick", "return getmew("+row.RowIndex+")");
}

then in javascript write this

function getmew(dd)
    {
     var b=document.getElementById("GridView1");
     var c=document.getElementById("TextBox1");
     var d=document.getElementById("TextBox2");
     dd=dd+1;
     c.value=document.getElementById("GridView1").rows[dd].cells[2].innerHTML;
     d.value=document.getElementById("GridView1").rows[dd].cells[3].innerHTML;
}

you can use rowdatabound also....do it in your way
good luck.........