How to add manually control while editing gridview? ASP.NET C#

Question

I search on google but i can't find the solution.e.Rows or e.row not working in my visual studio 2010.How can i get this property.I want that when i click on "edit" button then gridview have different columsn and one column name is "Data Type" then this column fill with "dropdownlist" and i select value from drop down list.My dropdown control id is "dropdownlist1" .How can i do it?.Here is my code "gridview edit" event code:

protected void GridView2_RowEditing(object sender, GridViewEditEventArgs e)
{
  DataTable t = (DataTable)Session["MyDataTable"];
  GridView2.EditIndex = e.NewEditIndex;
  DropDownList ddlName =
                (DropDownList)e.Row.FindControl("dropdownlist1"); // HERE IS ERROR AT "Row" 
  ddlName.DataTextField = "Data Type";
  ddlName.DataValueField = "Data Type";
  GridView2.DataSource = t;
  GridView2.DataBind();
}

Here is my aspx code :

  <asp:GridView ID="GridView2" runat="server" AutoGenerateDeleteButton="True" 
        AutoGenerateEditButton="True" BackColor="#DEBA84" BorderColor="#DEBA84" 
        BorderStyle="None" BorderWidth="1px" CellPadding="3" CellSpacing="2" 
        ShowHeaderWhenEmpty="True" onrowcancelingedit="GridView2_RowCancelingEdit" 
        onrowdeleting="GridView2_RowDeleting" onrowediting="GridView2_RowEditing" 
        onrowupdating="GridView2_RowUpdating" AutoGenerateColumns="False" 
        Width="92px">
        <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
        <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
        <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
        <RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
        <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
        <SortedAscendingCellStyle BackColor="#FFF1D4" />
        <SortedAscendingHeaderStyle BackColor="#B95C30" />
        <SortedDescendingCellStyle BackColor="#F1E5CE" />
        <SortedDescendingHeaderStyle BackColor="#93451F" />
    </asp:GridView>

</div>
<asp:TextBox ID="TextBox1" runat="server" Width="137px"></asp:TextBox>
<asp:DropDownList ID="DropDownList1" runat="server" Height="20px" 
    onselectedindexchanged="DropDownList1_SelectedIndexChanged" Width="140px">
    <asp:ListItem>int</asp:ListItem>
    <asp:ListItem>Varchar</asp:ListItem>
</asp:DropDownList>
<asp:CheckBox ID="Null" runat="server" />
<asp:CheckBox ID="Primary" runat="server" />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Insert" 
    style="margin-left: 59px" Width="56px" />
<asp:Button ID="Button2" runat="server" Height="33px" style="margin-left: 76px" 
    Text="Create Table" Width="94px" />

Is I'm on the right way?or how can i do it?And also tell me how can i update the gridview row.I insert values in gridview manually.There is no database connectivity etc.Thanks

on which Event of GridView You are trying e.Row??

Dgan
– Dgan

2016-04-14 13:43:34 +00:00
Commented Apr 14, 2016 at 13:43 — Dgan
– Dgan, Commented Apr 14, 2016 at 13:43

Martin Parenteau · Accepted Answer · 2016-04-14 14:27:54Z

1

You can retrieve the row with the index:

GridViewRow row = GridView2.Rows[e.NewEditIndex];

UPDATE

You can put the DropDownList in a TemplateField of the GridView:

<asp:GridView ...>
    ...
    <asp:TemplateField>
        <ItemTemplate>
            <asp:Literal runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "DataTypeValue")) %>' />
        </ItemTemplate>
        <EditItemTemplate>
            <asp:DropDownList ID="ddlTypeName" runat="server" ... />
        </EditItemTemplate>
    </asp:TemplateField>
    ...
</asp:GridView>

(I showed an optional ItemTemplate in case you want to display the selected data type)

Then you can retrieve the DropDownList in your event handler:

GridViewRow row = GridView2.Rows[e.NewEditIndex];
DropDownList ddlTypeName = (DropDownList)row.FindControl("ddlTypeName");
...

edited Apr 14, 2016 at 14:27

answered Apr 14, 2016 at 13:45

Martin Parenteau

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8 Comments

Saira Over a year ago

But i want that when i click on "edit" button then gridview have column which have name "Data Type" then this column fill with "dropdownlist" and i select value from drop down list.my dropdown control id is "dropdownlist1" .How can i do it?

Martin Parenteau Over a year ago

You can show your markup and add that new question to the one that you already asked. If the DropDownList is in a TemplateField of the GridView, you should be able to retrieve it with FindControl, like you do in your code sample (after replacing ddlName with dropdownlist1, if that is the name of your control).

Saira Over a year ago

I don't want to add new column or template field,I want that my "Data Type" column fill with "dropdownlist" when i press edit.

Martin Parenteau Over a year ago

Then, your "Data type" column should be a TemplateField. I don't see a better way to do it.

Saira Over a year ago

But i don't want to add extra column,if i add template field then extra column will be added,

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