Question

I am having editable Gridview with column named Country which has so long listing.

When I am showing data the value of Country is in Label but when I choose edit should show DropDownList with country listings. I am able to show listings. it should show the country selected as that was in label.

I have tried with this but dropdownlist is filled with System.Row.DataRowView also it is not set at SelectedValue given as cvalue

aspx page

<asp:TemplateField HeaderText="Country">
                            <ItemTemplate>
                                <asp:Label ID="lblCountry" runat="server" Text='<%#Bind("Country")%>'></asp:Label>
                            </ItemTemplate>
                            <EditItemTemplate>
                                <asp:DropDownList ID="ddlCCountry" runat="server" Height="21px" Style="margin-left: 0px"
                                    Width="194px">
                                    <asp:ListItem Value="-1">Select..</asp:ListItem>
                                    <asp:ListItem Value="af">Afghanistan</asp:ListItem>
                                    <asp:ListItem Value="ax">Aland Islands</asp:ListItem>
                                    <asp:ListItem Value="al">Albania</asp:ListItem>
                                 </asp:DropDownList>
                              <EditItemTemplate>  

.cs file

 void gvhoteldetail_RowDataBound(object sender, GridViewRowEventArgs e)
            {
                if (e.Row.RowState == DataControlRowState.Edit)
                {
                     string cnm="",cvalue="";
                     string getCountry = "Select * from tbl_countrynames where `Name`='" + cname + "'";
                     string getCountrynames = "Select * from tbl_countrynames";
                     MySqlConnection con = new MySqlConnection(connection);
                     MySqlCommand cmd1 = new MySqlCommand(getCountrynames, con);
                     DataSet ds1 = new DataSet();
                     MySqlDataAdapter da1 = new MySqlDataAdapter(cmd1);
                     da1.Fill(ds1);

                     MySqlCommand cmd = new MySqlCommand(getCountry, con);
                     DataSet ds = new DataSet();
                     MySqlDataAdapter da = new MySqlDataAdapter(cmd);
                     da.Fill(ds);
                     if (ds.Tables[0].Rows.Count > 0)
                     {
                            cnm = ds.Tables[0].Rows[0]["Name"].ToString();
                            cvalue = ds.Tables[0].Rows[0]["Value"].ToString();
                       }
                   DropDownList ddlcountry = (DropDownList)e.Row.FindControl("ddlCCountry");
                   ddlcountry.DataSource = ds1;
                   ddlcountry.SelectedValue = cvalue;
                   ddlcountry.DataBind();      
             }

What could be wrong?

Answer 1

This worked for me. When populating the GridView, you should populate each DropDownList in the RowDataBound event:

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    numberFormatDA formatDA = new numberFormatDA();

    DataTable mytable = new DataTable();
    DataColumn formatIDcolumn = new DataColumn("fkNumberFormat");
    DataColumn formatNameColumn = new DataColumn("numberFormat");

    mytable.Columns.Add(formatIDcolumn);
    mytable.Columns.Add(formatNameColumn);

    DataSet ds = new DataSet();
    ds = formatDA.getNumberFormatsDS();

    if ((e.Row.RowState & DataControlRowState.Edit) > 0)
    {
        TextBox txtSite = (TextBox)e.Row.FindControl("txtIDSite");

        DropDownList ddl = (DropDownList)e.Row.FindControl("ddlNumberFormat");
        DataRow[] rows = ds.Tables[0].Select();

        foreach (DataRow row in rows)
        {
            DataRow newrow = mytable.NewRow();
            newrow["fkNumberFormat"] = row["idnumberFormat"];
            newrow["numberFormat"] = row["numberFormat"];
            mytable.Rows.Add(newrow);
        }

        ddl.DataSource = mytable;
        ddl.DataTextField = "numberFormat";
        ddl.DataValueField = "fkNumberFormat";

        int numberFormatID = 0;
        Label lblFormatID = (Label)e.Row.FindControl("numberFormatLabel");
        numberFormatID = Int32.Parse(lblFormatID.Text);

        ddl.SelectedValue = numberFormatID.ToString();
        ddl.DataBind();
    }
}

Hope this helps!