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Getting the value of a Textbox in a TemplateField in a gridview

i'm gonna keep it short and simple
I'm a software engineering student in the 12th grade and as my final project I have decided to make a website. What the website is about doesn't really matter. The problem is this:
In the picture attached there is a textbox inside a templatefield inside that gridview. I need to get the value that the user writes inside. After you write a value you press Purchase. I've looked at similar questions and none offered a working solution. What happens is the value just disappears. I find the right control with FindControl, but the value gets deleted somehow. How do I know I am at the right control? I went to the client side and added to the asp:TextBox the following:
Text="5"
This works perfectly, so I know it gets to the right control but something makes it disappear. My gridview is being populated by a DataSet that is two datasets combined, and I put the Merge command and the DataSource and DataBind are both in if (!this.IsPostBack). I am completely lost and have no idea what to do, Help is much appreciated.The Picture of the Gridview

All the controls in a GridView are accessible by searching the correct row with FindControl. For that you can send the row number as a CommandArgument and use that in code behind. So first start by using OnCommand instead on OnClick and set the CommandArgument on the aspx page.
<asp:TemplateField>
<ItemTemplate>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Purchase" OnCommand="Button1_Command" CommandArgument='<%# Container.DataItemIndex %>' />
</ItemTemplate>
</asp:TemplateField>
And then in code behind
protected void Button1_Command(object sender, CommandEventArgs e)
{
//get the rownumber from the command argument
int rowIndex = Convert.ToInt32(e.CommandArgument);
//find the textbox in the corrext row with findcontrol
TextBox tb = GridView1.Rows[rowIndex].FindControl("TextBox1") as TextBox;
//get the value from the textbox
try
{
int numberOfTickets = Convert.ToInt32(tb.Text);
}
catch
{
//textbox is empty or not a number
}
}

Access textbox within asp.net repeater

I have a nested asp repeater which is displaying all my items correctly. I have another div within the ItemTemplate of each repeater which submits content to my code behind.
<asp:Repeater runat="server" id="repeaterNote" OnItemDataBound="repeaterNote_ItemDataBound">
<ItemTemplate>
<div id="note" class="staff"><p><%# Eval("Content") %></p><ul>
<li><%# Eval("AddedDate") %></li><li>20:29</li>
<li><%# Eval("AddedByName") %></li><li>
Add comment</li></ul>
<div id="addComment<%# Eval("NoteID") %>" class="staff" style="display:none">
<asp:TextBox ID="notecommenttext" runat="server" rows="4"> </asp:TextBox>
<asp:Button ID="Button" runat="server" Text="Add" CommandArgument='<%# Eval("NoteID") %>' OnCommand="Add_Comment" />
</div>
</div>
When I submit the button I want to retrieve the content within the textbook "notecommenttext". There doesn't seem to be an easy way to do this. I have tried to set the ID of the textbook to the unique "NoteID" but it appears that cannot be done.
string uniqueNoteID = e.CommandArgument.ToString();
int parent = int.Parse(uniqueNoteID);
TextBox txtName = new TextBox();
foreach(RepeaterItem noteItem in repeaterNote.Items)
{
if (noteItem.ItemType == ListItemType.Item || noteItem.ItemType == ListItemType.AlternatingItem)
{
Notes rin = (Notes)noteItem.DataItem;
if (rin.RelativeNoteId == parent)
{
txtName = (TextBox)noteItem.FindControl("notecommenttext");
}
}
}
The snippet above is from the button callback "Add_Comment", repeaterNote is my top level Repeater id. It seems to have the correct number of RepeaterItems but the DataItem property is always null. I have added an inner foreach loop to iterate over my nested repeater. Again, this correctly identifies only one of the top level repeaters has a nested repeater element, but the DataItem is still null.
Any suggestions on how I can access the content from within the textbook of each repeater?

I think instead of setting OnCommand in your button, you should set OnItemCommand in your repeater to your event handler and just set the CommandName property in your button to an easily identifiable string. Then in the repeater's OnItemCommand event handler, you do a Select Case on e.CommandName, and if it's that button's CommandName that you set, you can use e.Item.FindControl("notecommenttext") to get your textbox control. Then get its content. When a control is in a repeater its ID gets a bunch of stuff appended to it so it is hard to find outside of a repeater event like ItemCommand.

I think your problem is that you are doing the Binding mecanism in your Page_Load() method without testing if (!IsPostback) That's why you dont find the result you want. Don't forget to set EnableViewState="False"
So you should move your Binding mecanism in Page_LoadComplete() method if you are in aspx page or add in your page load
if(!IsPostback)
{
//your binding mecanism
}

GridView Button reference on rowdatabound

I feel like I'm missing something obvious here but I'm just not getting it. I have a gridview with a template field column where i have a button and a hidden field. I'm trying to get the reference to both the button and the hidden field on row databound, as both the button's label and commandargument etc change depending on the other row data.
If i place a breakpoint in the area indicated in the code below, I can see that the hidden field is being assigned to properly, but the button is not. What am I missing here?
GridView.aspx
<asp:GridView ID="gvCurrentQueueStatus" runat="server" AutoGenerateColumns="False"
OnRowDataBound="gvCurrentQueueStatus_RowDataBound">
<Columns>
<asp:TemplateField ItemStyle-HorizontalAlign="Center" HeaderText="Service Controls">
<ItemTemplate>
<asp:Button ID="btnSubmitCommand" runat="server" Text="Control" OnClick="btnSubmitCommand_Click" />
<asp:HiddenField ID="hdnQueueNumber" runat="server" Value='<%# Eval("ReportQueueNumber") %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
GridView.aspx.cs
protected void gvCurrentQueueStatus_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
Button controlButton = (Button)e.Row.FindControl("btnSubmitCommand"); // FindControl fails
HiddenField hdnQueueNumber = (HiddenField)e.Row.FindControl("hdnQueueNumber"); // FindControl succeeds
// Other stuff
} // breakpoint here, successfully finds htnQueueNumber, but not btnSubmitCommand
}

Try this:
Button controlButton = e.Row.FindControl("btnSubmitCommand") as Button ;
Or try this way:
foreach (GridViewRow row in gvCurrentQueueStatus.Rows) {
Button controlButton = (Button)gvCurrentQueueStatus.Rows[row.RowIndex].FindControl("btnSubmitCommand");
}

So apparently my button was in fact getting properly assigned to, it was just not reporting as such when mousing over the variable in my debugger.
I'm not actually crazy, Visual Studio's debugger is however and needed the old "have you tried turning it off and on again".
Sorry about that those that helped look into my issue :3

Bind a textbox value in a label box using c# inside a uframe

I have entered a value in text box and click the button the value should bind in a label.
The code must be in c# not in query. There is no database also.how please say the code behind in c#. It is button click event. while click the button the page should post back and bind the data how to bind a textbox value in a label box using c#. The value must bind in postback method.

easy , take a look at the below code:
<asp:TextBox Id="txt1" runat="server" />
<asp:button Id="btn1" runat="server" onClick="Button1_Click"/>
<asp:Label Id="lbl1" runat="server"/>
//in the code behind implement the Button1_Click
protected void Button1_Click (object sender, EventArgs e)
{
lbl1.Text= txt1.Text;
}

It as easy as the following:
LabelID.Text = TextBoxID.Text;
Where LabelID is the ID of your Label control and TextBoxID is the ID of your TextBox control.
You should place this code inside the button click's event.
Update
Please use for your purpose ASP.NET Web Server Controls.
<asp:TextBox ID="textBoxId" runat="server"/>
<asp:Label ID="labelId" runat="server"/>
Then you can access the values of Text property of both the above controls, like above:
labelId.Text = textBoxId.Text;

DetailsView FindControl() returns null after some postbacks

I've been working for a long time with GridViews and DetailsViews, but yesterday I've come across a new scenario, which I quite do not understand.
I have a GridView with ImageButton (CommandName="Insert") which will change the mode of the DetailsView to Insert. Afterwards I'll look for a DropDownList inside that DetailsView and add some items dynamically. Works fine, but one first the first time I press that ImageButton. If I click on "Cancel" in the DetailsView and press the ImageButton again, the .FindControl() Method returns null. What life cycle problem am I facing here?
I've created this sample: (To make it run in your Visual Studio, just bind a DataSource to the DetailsView, otherwise it will not be rendered)
Markup:
<asp:GridView ID="gvCategory" runat="server" OnRowCommand="gvCategory_RowCommand">
<Columns>
</Columns>
<EmptyDataTemplate>
<asp:ImageButton ImageUrl="~/images/add.png" ID="ibAdd" runat="server" CommandName="Insert" />
</EmptyDataTemplate>
</asp:GridView>
<asp:DetailsView ID="dvCategory" runat="server" Width="150px" AutoGenerateRows="false"
AutoGenerateInsertButton="True" DataSourceID="LinqDataSource1">
<Fields>
<asp:TemplateField HeaderText="foo">
<InsertItemTemplate>
<asp:DropDownList ID="ddlCategory" runat="server" Width="150"></asp:DropDownList>
</InsertItemTemplate>
</asp:TemplateField>
</Fields>
</asp:DetailsView><asp:LinqDataSource ID="LinqDataSource1" runat="server"
ContextTypeName="WebApplication1.DataClasses1DataContext"
TableName="Categories"></asp:LinqDataSource>
Codebehind:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
this.gvCategory.DataBind();
}
}
protected void gvCategory_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Insert")
{
this.dvCategory.ChangeMode(DetailsViewMode.Insert);
DropDownList _ddlCat = (DropDownList)this.dvCategory.FindControl("ddlCategory");
if (_ddlCat != null)
{
_ddlCat.Items.Clear();
_ddlCat.Items.Add(new ListItem() { Text = "-- empty --", Value = "-1" });
}
}
}
I have also tried using a ItemTemplate, and not a InsertItemTemplate, but this results in the same. After using the ChangeMode-Method the DetailsView.CurrentMode == InsertMode. The only thing I can think of is, that the markup is already generated for the ItemTemplate and changing the Mode to InsertMode can't affect the rendered markup, or something like this.
Does anybody have a solution to this? =)

I think you are on the right track. It's hard to tell without seeing all of the code, but basically any time you change the rendering mode of a row in a repeater-type control you need to rebind it so that it's re-rendered. The fact that FindControl is returning NULL means only one thing: THE CONTROL IS NOT THERE. Which means it was not rendered. You can verify this by looking at the control hierarchy.
So, in your handler for Cancel are you rebinding?