how to edit child gridview record

[nitinp]

I am facing the problem in editing records in child gridview which i have placed in the parent gridview's cell. I have bound both parent and child with different sqlDataSource objects.

I have written following code to papulate child gridview and given Edit/Update column in it.

protected void gvMaster_RowDataBound(object sender, GridViewRowEventArgs e)
{
int intMAsterID1;
if (e.Row.RowType == DataControlRowType.DataRow)
{
GridView grd = new GridView();
grd = e.Row.FindControl("gvChild") as GridView;
intMAsterID1 = Convert.ToInt32(e.Row.Cells[1].Text);

if (grd != null)
{
grd.DataSourceID = "";

string mySQL = "SELECT ...FROM.... WHERE....a.id=" + intMAsterID1;


sqlDataSourceChild.SelectCommand = mySQL;
grd.DataSource = sqlDataSourceChild;
grd.DataBind();
}
}
}

When I click the Edit link in the child gridview then nothing happens but the page refreshes

Please give me solution
Thanks
nitinp