Dynamic Dropdownlist which is creted inside Gridview it`s SelectedValue property is not having correct value in asp.net

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ASP.NET

Hi all,

I created a dynamic Gridview to display data in asp.net, in ItemTemplate i used Lables to display values of all fields, in EditItemTemplate i used Dropdownlist for last six columns.Possible values of dropdownlist are as follows:

DropDownList ddl = new DropDownList();
           ddl.Items.Add(new ListItem("YES", "YES"));
           ddl.Items.Add(new ListItem("NO", "NO"));
           ddl.Items.Add(new ListItem("N/A", "N/A"));

After clickin Edit button in Gridview dropdownlists are displaying with actual selectedvalues so there is no problem here at all, after that i am changing the dropdowlist value as "YES" from "NO", then i am clicking Update link button in Gridview, in RowUpdating event of Gridview i am capturing the dropdownlist SelectedValues to update corresponding tabel in sql server.

The problem is here only that is dropdownlist selectdvalue property have the "NO" value eventhough i selected "YES".

here code for Dynamic Gridview and dynamic Lable,Dropdownlist as follows:

public class GridViewTemplate:System.Web.UI.Page, ITemplate
    {
        public int iRowCount;
        public int iColumnCount;
        ListItemType templateType;
        int i;
        int j;
        static string [] vColName=new string [15];
        static object[,] values = new object[200, 200];
        static int colNo = 0;
        static int rowNo = 0;
        public GridViewTemplate(ListItemType type, string colvalue, int colsno, int rowsno, int dtrows, int dtcols,string ColName)
        {
            templateType = type;
            i= colsno;
            j = rowsno;                   
            if (colvalue == "")
            {
                values[j, i] = "N/A";
            }
            else
            {
                values[j, i] = colvalue;
            }                    
            iRowCount = dtrows;
            iColumnCount = dtcols;
            vColName[i] = ColName;
        }
        public  void InstantiateIn(System.Web.UI.Control container)
        {
            Literal lc = new Literal();
            Label lbl = new Label();
            LinkButton lb = new LinkButton();
            DropDownList ddl = new DropDownList();            
            ddl.Items.Add(new ListItem("YES", "YES"));
            ddl.Items.Add(new ListItem("NO", "NO"));
            ddl.Items.Add(new ListItem("N/A", "N/A"));
           
            switch (templateType)
            {
                case ListItemType.Header:
                    lb.Text = "Edit";
                    lb.CommandName = "EditButton";
                    container.Controls.Add(lb);
                    container.Controls.Add(lc);
                    break;
                case ListItemType.Item:                        
                    
                    while (rowNo < iRowCount)
                    {
                        while (colNo < iColumnCount)
                        {                            
                            lbl.Text = Convert.ToString(values[rowNo, colNo]);
                            colNo++;
                            break;
                        }
                        if (colNo >= iColumnCount)
                        {
                            rowNo++;
                            colNo = 0;
                        }
                        if (rowNo >= iRowCount)
                        {
                            rowNo = 0;
                        }
                        break;
                    }
                    container.Controls.Add(lbl);
                (ckh);
                    break;
                case ListItemType.EditItem:
                                      while (rowNo < iRowCount)
                    {
                        while (colNo < iColumnCount)
                        {
                            string fielddata = Convert.ToString(values[rowNo, colNo]);
                            if (fielddata == "NO" | fielddata == "YES" | fielddata =="N/A")
                            {
                                if (colNo >= 7)
                                { ddl.ID ="ddl"+ vColName[colNo]; }
                                 ddl.SelectedValue = Convert.ToString(fielddata);
                                if (ddl.SelectedValue == "N/A")
                                    ddl.Enabled = Convert.ToBoolean("false");
                                container.Controls.Add(ddl);
                            }
                            else
                            {
                                if (colNo < 7)
                                { lbl.ID = "lbl"+ vColName[colNo]; }
                                lbl.Text = Convert.ToString(fielddata);
                                container.Controls.Add(lbl);
                            }
                            colNo++;
                            break;
                        }
                        if (colNo >= iColumnCount)
                        {
                            rowNo++;
                            colNo = 0;
                        }
                        if (rowNo >= iRowCount)
                        {
                            rowNo = 0;
                        }
                        break;
                    }
                        break;
                case ListItemType.Footer:                   
                    container.Controls.Add(lc);
                    break;
            }
        }
    }
}

Here is the code for Gridview_RowUpdating

protected void gvVendorSupportDocuments_RowUpdating(object sender, GridViewUpdateEventArgs e)
       {
           Getdata();
           SupportDocumentsForVerdorPersistence sdvpUpdateSuppDoct = new SupportDocumentsForVerdorPersistence();
           GridViewRow row = gvVendorSupportDocuments.Rows[e.RowIndex];
           DataSet dsVendorSD = new DataSet();
           dsVendorSD = ((DataSet)ViewState["VendorSupportDocuments"]);
           for (int i = 0; i < dsVendorSD.Tables[0].Columns.Count; i++)
           {
               if (i <= 6)
               {
                   field_value =((Label )row .FindControl("lbl" + dsVendorSD.Tables[0].Columns[i].ColumnName)).Text;
                   ParameterArray.Add(field_value);
               }
               if (i > 6)
               {
                   DropDownList ddldoct = (DropDownList)row.FindControl("ddl" + dsVendorSD.Tables[0].Columns[i].ColumnName);
          field_value = ddldoct.SelectedValue .ToString();                    //field_value =Convert .ToString (((DropDownList)row.FindControl("ddl" + dsVendorSD.Tables[0].Columns[i].ColumnName)).SelectedItem   );
                   ParameterArray.Add(field_value);
               }
           }

Please anybody help me.
Thanks in Advance
Uday