I have a GridView with an anonymous type. I need to check the value in a cell and highlight that cell if a condition is met. The problem is, I always get an empty string when I try to pull data out of the row's cells. I have successfully highlighted all the cells and I have checked in the Visual Studio 2010 debugger and confirmed that the Row has data (the row's DataItem has the values I need). This is happening on a PostBack, I'm not sure if that's a problem or not.
Here is the code and solutions I've tried:
protected void grvValidCourses_RowDataBound(Object sender, GridViewRowEventArgs e) {
if (e.Row.RowType == DataControlRowType.DataRow) {
String str = e.Row.Cells[6].Text.ToString(); // empty string
Label lbl = (Label) grvValidCourses.FindControl("lblEndDate"); // null
DataRowView rowView = (DataRowView)e.Row.DataItem; // exception about casting anonymous type
What's going on here? Why can't I get data from the cells?
Markup for GridView:
<asp:GridView ID="grvValidCourses" runat="server" Width="790px" OnRowCancelingEdit="grvValidCourses_RowCancelingEdit"
OnRowEditing="grvValidCourses_RowEditing" OnRowUpdating="grvValidCourses_RowUpdating" OnRowDeleting="grvValidCourses_RowDeleting"
AutoGenerateColumns="False" OnSelectedIndexChanged="grvValidCourses_SelectedIndexChanged"
OnRowDataBound="grvValidCourses_RowDataBound" >
<Columns>
<asp:CommandField ShowEditButton="True" EditText="Edit" UpdateText="Update |" />
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton ID="lbnDelete" runat="server" CausesValidation="False" CommandName="Delete"
Text='<%# (Eval("active") == null ? "Delete" : ((Eval("active").ToString() == "0" ? "Restore" : "Delete"))) %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField ShowSelectButton="True" SelectText="Details" />
<asp:TemplateField HeaderText="Training Name" SortExpression="coursename">
<EditItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("coursename") %>'></asp:Label>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("coursename") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="ttNo" HeaderText="#" SortExpression="ttNo" ReadOnly="True" />
<asp:TemplateField HeaderText="Course Date" SortExpression="startDate">
<EditItemTemplate>
<asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("startdate", "{0:M/d/yyyy}") %>'></asp:TextBox>
<asp:CalendarExtender ID="TextBox3_CalendarExtender" runat="server" Enabled="True"
TargetControlID="TextBox3" Format="M/d/yyyy">
</asp:CalendarExtender>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("startdate", "{0:M/d/yyyy}") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Expiry Date" SortExpression="endDate">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("enddate", "{0:M/d/yyy}") %>'></asp:TextBox>
<asp:CalendarExtender ID="TextBox1_CalendarExtender" runat="server" Enabled="True"
TargetControlID="TextBox1" Format="M/d/yyyy">
</asp:CalendarExtender>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblEndDate" runat="server" Text='<%# Bind("enddate", "{0:M/d/yyyy}") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>No valid courses found.</EmptyDataTemplate>
</asp:GridView>
UPDATE: I've been trying all your suggestions, but I get exceptions or nulls or empty strings. I've even re-created the problem in a simpler example and still can't figure it out! I'll keep trying though, and I appreciate any new suggestions.
Part 1 - Missing Text
You are probably getting blank values in the first part due to a need to access a child control:
String str = ((DataBoundLiteralControl)e.Row.Cells[6].Controls[0]).Text;
To see if your cells have any values in debug mode (check text in debug output window):
void grvValidCourses_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
System.Diagnostics.Trace.WriteLine(e.Row.Cells.Count);
foreach (TableCell c in e.Row.Cells)
{
System.Diagnostics.Trace.WriteLine(c.Text);
}
}
}
Part 2 - Missing Control
This is wrong:
Label lbl = (Label) grvValidCourses.FindControl("lblEndDate"); // null
You can't search the gridview for a row's control. You need to search the row.
Label lblProductOptionGrpName = (Label)e.Row.FindControl("lblProductOptionGrpName");
Part 3 - Accessing DataItem
DataBinder.Eval(e.Row.DataItem, "ColumnName")
Finally, I'm not sure what you're doing with your anonymous types, but you may need to check the contents before accessing properties:
if(MyControl.GetType() == typeof(HyperLink))
{
HyperLink TestLink = (HyperLink)MyControl;
TestLink .Visible = false;
}
Okay I finally figured out what is going on! I can only access the bound field through the row (e.g. e.Row.Cells[index].Text). So I used the bound field to get the ID of my item, then found the item in the database, got the date, compared it, and highlighted the row's cells. Not the most efficient way, but it works.
Code from simple sample:
Grid View Front End
<asp:GridView ID="gdv" runat="server" AutoGenerateColumns="True" OnSelectedIndexChanged="gdv_SelectedIndexChanged">
<Columns>
<asp:CommandField ShowSelectButton="True" SelectText="Select" />
<asp:BoundField DataField="id" HeaderText="#" ReadOnly="True" />
<asp:TemplateField HeaderText="CategoryName" >
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description" >
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("desc") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Label ID="lblSelected" runat="server" Text="No row selected"></asp:Label>
Code Behind Page
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) {
var qry = ctx.Categories
.Select(c => new {
id = c.CategoryID,
name = c.CategoryName,
desc = c.Description,
});
gdv.DataSource = qry;
gdv.DataBind();
}
}
protected void gdv_SelectedIndexChanged(object sender, EventArgs e) {
selectRow();
}
private void selectRow() {
GridViewRow row = gdv.SelectedRow;
String strId = row.Cells[1].Text; // Bound Field column
lblSelected.Text = strId;
// use ID to get object from database...
}
If you can post markup, then it will be possible to figure out your issue.
You are doing this in wrong way,
this DataRowView rowView = (DataRowView)e.Row.DataItem;
should be DataRow rowView = ((DataRowView)e.Row.DataItem).Row;
protected void gridPanne_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType==DataControlRowType.DataRow)
{
Label label = (Label)e.Row.FindControl("Label4");
lbl.Text += " ** / ** "+label.Text;
}
}
Related
How Do I Transfer Grid view values to next page. Grid view consist one of the text box(txtItemGroup) which values have to be entered by the user dynamically, not from the Data base.
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" HorizontalAlign="Center">
<Columns>
<asp:TemplateField HeaderText="Item Name">
<ItemTemplate>
<asp:Label ID="lblName" runat="server" Text='<%# Eval("TestItemName") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Items Group">
<ItemTemplate>
<asp:Label ID="lblGroup" runat="server" Text='<%# Eval("TestItemGroup") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Group">
<ItemTemplate>
<asp:TextBox ID="txtItemGroup" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Item Values">
<ItemTemplate>
<asp:Label ID="lblItemValue" runat="server" Text='<%# Eval("TestItemValues") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Default Values">
<ItemTemplate>
<asp:Label ID="lblDefaultValues" runat="server" Text='<%# Eval("DefaultValues") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
In your GridView's RowCommand event put in the following code:
if (e.CommandName == "Send")
{
TextBox txt = (TextBox)GridView1.FindControls("txtItemGroup");
Session["ItemGroup"] = txt.Text;
}
In addition to this, put a Button or LinkButton in your GridView's ItemTemplate to send the value of the appropriate Textbox as you have put a TextBox and set it's CommandName property in the .aspx page as:
<asp:Button id="btnSend" runat="server" Text = ">" commandName="Send"/>
And then in the Page_Load event of the page where you want the value of TextBox to be viewed:
if (!IsPostback)
{
Label1.Text = Session["ItemGroup"].ToString();
//or
Label1.Text = (String)Session["ItemGroup"];
}
try this:-
Add a button just below that textbox like this:-
<asp:Button ID="btnsend" Text="Send" runat="server" CommandName="Send" />
In RowCommand event write like this:-
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Send")
{
GridViewRow row = (GridViewRow)((Control)e.CommandSource).NamingContainer;
TextBox TextBox1 = row.FindControl("txtItemGroup") as TextBox;
Response.Redirect("yourasppage.aspx?txt=" + TextBox1.Text);
}
}
On page load of `yourasppage.aspx' use this code
string txtval = Request.QueryString["txt"];
Hope this will help
I am having a GridView in my web page. Which is displaying the data with the columns as Status, Name , Id and Action. My status column always filled with the 3 values(Complete, Queued and Failed) randomly.
Now I want to display this status column values as a link ,If it is having the value either "Failed" or "Queued". But "Complete" status should not be display as a link.
How Can I achive this design during the runtime?
My Code for binding the data into the grid is,
protected void Page_Load(object sender, EventArgs e)
{
DataTable dtActionList = clsactionList.GetADActionList();
grdADActionList.DataSource = dtActionList;
grdADActionList.DataBind();
}
protected void grdADActionList_RowDataBound(object sender, GridViewRowEventArgs e)
{
foreach (GridViewRow gvr in grdADActionList.Rows)
{
if ((gvr.FindControl("Label1") as Label).Text == "Completed")
{
(gvr.FindControl("Label1") as Label).Visible = true;
(gvr.FindControl("HyperLink1") as HyperLink).Visible = false;
}
}
}
using this code I am just simply binding the values in the grid. I am not able to create the Status column as having link buttons based on the binded values for that status column.
My .aspx Code is:
<asp:GridView ID="grdADActionList" runat="server" Height="83px" Width="935px" AutoGenerateColumns="false" OnRowDataBound="grdADActionList_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="Status" SortExpression="Status">
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='http://localhost:52807/Default.aspx?'><%# Eval("Status") %>
</asp:HyperLink>
<asp:Label ID="Label1" runat="server" Text="<%# Container.DataItem %>" Visible="False"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="GivenName" HeaderText="GivenName"/>
Please help me to do this further....
On GridViewDataBound event, just hide the link and display a simple label if the value is complete.
ASP.NET:
<asp:TemplateField HeaderText="Status" SortExpression="Status">
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='your_url'>
<%# Eval("Status") %>
</asp:HyperLink>
<asp:Label ID="Label1" runat="server" Text="<%# Eval("Status") %>" Visible="False"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
C#:
protected void onGridViewDataBound()
{
foreach(GridViewRow gvr in grd)
if((gvr.FindControl("Label1") as Label).Text.ToLower() == "complete") // Updated Line
{
(gvr.FindControl("Label1") as Label).Visible = true;
(gvr.FindControl("HyperLink1") as HyperLink).Visible = false;
}
}
you have to work in design file means .aspx file
you have to use and
<asp:GridView ID="GridView1" runat="server" EnableModelValidation="True">
<asp:TemplateField HeaderText="Hyperlink">
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server"
NavigateUrl='<%# Eval("CODE", #"http://localhost/Test.aspx?code={0}") %>'
Text='link to code'>
</asp:HyperLink>
</ItemTemplate>
You can place an handler on RowDataBound event
protected void gw_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DataRowView v_DataRowView = (DataRowView)e.Row.DataItem;
string NavigateUrl = <....place your link here with DataRowView info>
e.Row.Attributes.Add("onclick", NavigateUrl);
}
}
For now you have your columns auto generated, so first disable that feature. Then you need to define each column as a BoundField, and for the hypelink, taking into account your condition, the best way is to define template field:
<asp:GridView ID="grdADActionList" runat="server" BorderStyle="Double" BorderWidth="3px"
Height="83px" Width="935px"
AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="Name" HeaderText="Name"/>
<asp:BoundField DataField="Action" HeaderText="Action"/>
<asp:BoundField DataField="Id" HeaderText="Id"/>
<asp:TemplateField HeaderText="Status">
<ItemTemplate>
<asp:HyperLink runat="server" NavigateUrl="~/link/address" Text='<%# Eval("Status") %>'
Visible='<%# (int)Eval("Status") != 1 %>'/>
<asp:Label runat="server" Text='<%# Eval("Status") %>'
Visible='<%# (int)Eval("Status") == 1 %>'>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Note that this is just a variation - you have not specified what values does Status column contain, so I assumed this is int-based enumeration.
I have a ASP:grid which has a link button, i need to some how reference that on the code behind when its clicked but im struggling on the syntax
Heres my ASP:Grid i need to execute code in the code behind when that link button 'Re-Take' is pressed and also be able to know what row it was clicked on as i will need to reference the users emails and name and then send an email with the relevant information....
<asp:GridView ID="GrdViewUsers" runat="server" AutoGenerateColumns="false" GridLines="None"
EnableViewState="false" class="tablesorter">
<AlternatingRowStyle></AlternatingRowStyle>
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton Text="Re-Take" runat="server" ID="Edit" CommandName="Edit"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Full Name">
<ItemTemplate>
<asp:HyperLink ID="HyperFullName" CssClass="gvItem" runat="server" NavigateUrl='<%#Eval("UserID","/ExamPaper.aspx?uid={0}") %>'
Text='<%# DataBinder.Eval(Container,"DataItem.FullName") %>'></asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Email">
<ItemTemplate>
<asp:Label ID="lblSurname" CssClass="gvItem" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Email") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Exam Taken">
<ItemTemplate>
<asp:Label ID="lblUsername" CssClass="gvItem" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.ExamTaken") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Date Taken">
<ItemTemplate>
<asp:Label ID="lblUsername" CssClass="gvItem" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.DateTaken") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Exam Total">
<ItemTemplate>
<asp:Label ID="lblUsername" CssClass="gvItem" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.ExamTotal") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
If someone can help me with a snippet i would highly appreciate it
You could approach this slightly different. You see, when a control is placed inside a gridview, any event raised from that control raises also the RowCommand on the GridView.
To get what you want you could then add both CommandName and CommandArgument to your LinkButton and then catch it in the GridView's RowCommand.
<asp:LinkButton id="LinkButton1" runat="server" commandName="LinkButtonClicked" commandArgument='Eval("myObjectID")' />
where myObjectID is the name of the ID column of your object you bind the grid to.
Then
void GridView1_RowCommand( object sender, GridViewCommandEventArgs e )
{
if ( e.CommandName == "LinkButtonClicked" )
{
string id = e.CommandArgument; // this is the ID of the clicked item
}
}
see: ASP.net GridView: get LinkItem's row
FindControl should work in this case.
protected void GrdViewUsers_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
HyperLink myHyperLink = e.Row.FindControl("Edit") as HyperLink;
}
}
First: You have repeating ID's in your TemplateFields like lblUsername what is not allowed since it's the same NamingContainer.
You can pass the RowIndex as CommandArgument to RowCommand:
on aspx:
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton
Text="Re-Take"
runat="server"
ID="Edit"
CommandName="Edit"
CommandArgument="<%# ((GridViewRow) Container).RowIndex %>">
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
Handle the GridView's RowCommand:
void GrdViewUsers_RowCommand(Object sender, GridViewCommandEventArgs e)
{
if(e.CommandName=="Edit")
{
int index = Convert.ToInt32(e.CommandArgument);
GridViewRow row = GrdViewUsers.Rows[index];
// now you can get all of your controls like:
Label lblSurname = (Label)row.FindControl("lblSurname");
String email = lblSurname.Text // you noticed that DataItem.Email is bound to lblSurname?
}
}
Suppose the grid has linkbutton on which we want to get row index
<asp:LinkButton ID="lnkbtnAdd " runat="server" CommandName="cmdAdd" ImageUrl="~/Images/add.gif" ></asp:LinkButton>
In code behind, In OnRowCreated event we attach row number of grid to each button of row to get it back when it is clicked in RowCommand event
protected void gvListing_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
System.Web.UI.WebControls.LinkButton lnkbtnAdd = new System.Web.UI.WebControls.LinkButton();
lnkbtnAdd = (System.Web.UI.WebControls.LinkButton)e.Row.FindControl("lnkbtnAdd");
if (lnkbtnAdd != null)
lnkbtnAdd .CommandArgument = e.Row.RowIndex.ToString();
}
}
In RowCommand event we will get back the current row index and set the selected index of the grid
protected void gvListing_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.ToString() == "cmdAdd")
{
int RowIndex = int.Parse(e.CommandArgument.ToString());// Current row
}
}
The following code is my Grid View AA from aspx page.
<asp:GridView ID="GridView_AA" runat="server" OnSorting = "Gridview_AA_Sorting" OnRowCreated="GridView_AA_RowCreated">
<asp:TemplateField HeaderText="Period Name" SortExpression="PERIOD_NAME">
<EditItemTemplate>
<asp:TextBox ID="txtGVPeriodName" runat="server" Text='<%# Bind("PERIOD_NAME") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblGVPeriodName" runat="server" Text='<%# Bind("PERIOD_NAME") %>' Visible="False"></asp:Label>
<asp:LinkButton ID="lborganize" runat="server" OnClick="lborganize_Click" Text='<%# Bind("PERIOD_NAME") %>'></asp:LinkButton>
</ItemTemplate>
<HeaderStyle HorizontalAlign="Center" Width="400px" />
<ItemStyle HorizontalAlign="Center" Width="400px" />
</asp:TemplateField>
</asp:GridView>
I cannot sort after adding GridView_AA_RowCreated function. Each column of Grid view header-text worked well before I add this Row Created function. If I cut the following code: e.Row.Cells[2].Text = "Period Name";
Sorting works. I want to get sorting without removing this Row Created function. Do you have any brighter solution about my problem?
protected void GridView_AA_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
e.Row.Cells[2].Text = "Period Name"; //Change header text in run-time
}
}
The above problem is solved after I changed the following code into the Row Created function:
protected void GridView_AA_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
LinkButton lb_pname = (LinkButton)(e.Row.Cells[2].Controls[0]);
lb_pname.Text = "Period Nameāļ°";
e.Row.Cells[2].Controls.Add(lb_pname);
}
}
I have a GridView with the following columns
<asp:TemplateField HeaderText="Name">
<FooterTemplate>
<asp:TextBox ID="txt_Name" runat="server"></asp:TextBox>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lbl_name" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "t_Name") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txt_name" runat="server" Width="100px" Text='<%#DataBinder.Eval(Container.DataItem,"t_Name") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Created By">
<ItemTemplate>
<asp:Label ID="lbl_tabcreatedby" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "t_CreatedBy") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField HeaderText="Modify" ShowEditButton="True" />
<asp:CommandField HeaderText="Delete" ShowDeleteButton="True" />
<asp:TemplateField HeaderText="Add a New Name">
<FooterTemplate>
<asp:LinkButton ID="lnkbtn_AddName" runat="server" CommandName="Insert">Add Name</asp:LinkButton>
</FooterTemplate>
</asp:TemplateField>
And then in the Code Behind I am trying to access the txt_Name Textbox as
protected void gv_Name_RowCommand(object sender, GridViewCommandEventArgs e)
{
string t_Name = ((TextBox)(gv_Name.FooterRow.FindControl("txt_Name"))).Text;
// Insert Code
}
But I am getting null in the string t_Name everytime irrespective of what is the current Text of txt_Name.
However I can get the text if I disable the ViewState for the page. Any explanation.
I have got around this problem by using an additional variable, see the following:
Dim txtBox As TextBox = GridView1.FooterRow.FindControl("txtName")
Dim name As String = txtBox.Text
or you can try getting the textbox by column index, like following:
protected void gv_Name_RowCommand(object sender, GridViewCommandEventArgs e)
{
string t_Name = ((TextBox)(gv_Name.FooterRow.Cells[5].FindControl("txt_Name"))).Text;
// Insert Code
}
Try following code in gv_Name_RowCommand event
if (e.CommandName.Equals("Insert"))
{
string t_Name = ((TextBox)(gv_Name.FooterRow.FindControl("txt_Name"))).Text;
}
this should work
i think you data grid is being disconnected from the data source upon post back. If you are sure that data/ data value coming from db is not null.