find a control by id from Dynamically added Template field in GridView - asp.net

Question

Hi i added template field dynamically to gridview by implementing ITemplate interface.
The template field contains some controls like label and textboxes. how do i get these controls in row databound event.
I am not able to get when i do gridviewrow.findcontrol("id") as i do normally when we add templatefield from aspx page.
The way i added template field is like this
public class CustomGridViewColumn : ITemplate
{
ListItemType _liType;
string _columnName;
public CustomGridViewColumn(ListItemType type, string column)
{
_liType = type;
_columnName = column;
}
void ITemplate.InstantiateIn(System.Web.UI.Control container)
{
switch (_liType)
{
case ListItemType.Header:
Label lblHeader = new Label();
lblHeader.Text = _columnName;
container.Controls.Add(lblHeader);
break;
case ListItemType.Item:
Label lblItem = new Label();
lblItem.DataBinding += new EventHandler(lbl_DataBinding);
lblItem.ID = "lbl" + _columnName;
lblItem.ClientIDMode = ClientIDMode.Predictable;
container.Controls.Add(lblItem);
DropDownList ddl = new DropDownList();
ddl.DataBinding += new EventHandler(ddl_DataBinding);
ddl.ID = "ddl" + _columnName;
ddl.Visible = false;
container.Controls.Add(ddl);
break;
}
}
}
Now i want access the label and dropdown which i have added using this code.
when i do gridviewrow.findcontrol("id") i am not getting them.
Can any one please help me.
I am geeting when i go through all the rows and try to find but
i have a check box in a row when i select it all labels should diappear and ddls dhould appear
for this i am using the follwoing code.
protected void chkEdit_CheckedChanged(object sender, EventArgs e)
{
CheckBox chkEditTest = (CheckBox)sender;
GridViewRow grow = (GridViewRow)chkEditTest.NamingContainer;
DropDownList ddl = (DropDownList)grow.FindControl("ddl");
Label lbl= (Label)grow.FindControl("lbl");
}
when i do this i am not able to get the controls.
it seems like controls are disapppearing on postback..

Answer 1

This is what I came up with and I can able to get the control reference in the code behind.
public class CustomGridViewColumn : ITemplate
{
ListItemType _liType; string _columnName;
public CustomGridViewColumn(ListItemType type, string column)
{
_liType = type;
_columnName = column;
}
void ITemplate.InstantiateIn(Control container)
{
switch (_liType)
{
case ListItemType.Header:
Label lblHeader = new Label();
lblHeader.Text = _columnName;
container.Controls.Add(lblHeader);
break;
case ListItemType.Item:
Label lblItem = new Label();
lblItem.DataBinding += new EventHandler(lblItem_DataBinding);
lblItem.ID = "lbl" + _columnName;
lblItem.ClientIDMode = ClientIDMode.Predictable;
container.Controls.Add(lblItem);
DropDownList ddl = new DropDownList();
ddl.DataBinding += new EventHandler(ddl_DataBinding);
ddl.ID = "ddl" + _columnName;
ddl.Visible = false;
ddl.DataSource = new string[] { "Hello", "World" };
container.Controls.Add(ddl);
break;
}
}
void ddl_DataBinding(object sender, EventArgs e)
{
}
void lblItem_DataBinding(object sender, EventArgs e)
{
}
}
protected void Page_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add("Name");
DataRow oItem = dt.NewRow();
oItem[0] = "Deepu";
dt.Rows.Add(oItem);
oItem = dt.NewRow();
oItem[0] = "MI";
dt.Rows.Add(oItem);
GridView gv = new GridView();
gv.ID = "myGridView";
gv.AutoGenerateColumns = false;
BoundField nameColumn = new BoundField();
nameColumn.DataField = "Name";
nameColumn.HeaderText = "Name";
gv.Columns.Add(nameColumn);
TemplateField TmpCol = new TemplateField();
TmpCol.HeaderText = "Template Column";
gv.Columns.Add(TmpCol);
TmpCol.ItemTemplate = new CustomGridViewColumn(ListItemType.Item, "TEST");
gv.DataSource = dt;
gv.DataBind();
Form.Controls.Add(gv);
}
protected void Button1_Click(object sender, EventArgs e)
{
GridView gv = Form.FindControl("myGridView") as GridView;
foreach (GridViewRow item in gv.Rows)
{
var ddl = item.FindControl("ddlTest") as DropDownList;
if (ddl != null)
{
ddl.Visible = true;
}
var lbl = item.FindControl("lbl") as Label;
if (lbl != null)
{
lbl.Text = "hello";
}
}
}
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</form>
Thanks
Deepu

Answer 2

Can you try using row index of GRIDVIEW control
var rowIndex = int.Parse(e.CommandArgument)
GridView1.Rows[rowIndex].FindControl("id")
Also refer
http://forums.asp.net/t/998368.aspx/1
http://www.codeproject.com/Articles/12021/Accessing-the-different-controls-inside-a-GridView
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridviewrow.aspx
Thanks
Deepu