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        for (int i = 0; i < GridView1.Rows.Count; i++)
        {
            DropDownList ddl = this.GridView1.Rows[i].FindControl("ddlTest") as DropDownList;
            ddl.DataSource = dt;
            ddl.DataTextField = "a";
            ddl.DataValueField = "b";
            ddl.DataBind();
            ddl.Items.Insert(0, new ListItem("--ÇëÑ¡Ôñ--", "0"));
            ddl.AutoPostBack = true;
        }
    }
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