How to read textbox value in Gridview RowEditing Event

Question

Hi Every one
 How to read textbox value in Gridview RowEditing Event I tried the following But it becomes Null Any one Help me Plz

GridViewRow row = (GridViewRow)gdvLocations.Rows[Convert.ToInt32(e.NewEditIndex)];

            TextBox txtEditAddress = ((TextBox)row.Cells[1].Controls[0].FindControl("txtAddress"));