Unable to cast object of type 'System.Web.UI.WebControls.GridViewRow' to type 'System.Web.UI.WebControls.GridView'

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C#

Hi,
i have gridview. i have entered some data into grid view. after that i clicked on save button.this event goes to GetLatestDataFromGrid method.there its giving error

protected void SavePlanningGoods()
   {
       
           DataTable lDtLatestInfo;
           lDtLatestInfo = GetLatestDataFromGrid();
}

private DataTable GetLatestDataFromGrid()
   {


       DataTable lDtMenuDisplay = obj.gridTableSchema();
       DataRow lDrMenuDisplay;

       foreach (GridView lgPlanningGoods in gvPlanningGoods.Rows)--here i m getting error
       {
           Label lblsupcat = (Label)lgPlanningGoods.FindControl("lblsupcat");
           TextBox txtYear = (TextBox)lgPlanningGoods.FindControl("txtYear");
           TextBox txtPeriod = (TextBox)lgPlanningGoods.FindControl("txtPeriod");
           DropDownList drpCategory = (DropDownList)lgPlanningGoods.FindControl("drpCategory");