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How can I pass ItemTemplate value to another page?

Greetings fellow developers. I am new to ASP.NET C# so pardon me if there are areas that I missed out/
Current in my project, I have this Gridview - where I used "TemplateField" for almost every data field. My issue is, I do not know how can I pass the value in to another page. I tried using SESSION but unfortunately, it is not working. I also tried using BOUNDFIELD, it works but it does not fulfil my project requirement as the default setting for BOUNDFIELD is textbox, I want it to be a DROPDOWN LIST control instead. Any kind advice would be much appreciated. Attached below is my codes.
WebForm1.aspx
<asp:GridView ID="Gridview1" runat="server" AutoGenerateColumns="False" OnPageIndexChanging="Gridview1_PageIndexChanging" OnRowCancelingEdit="Gridview1_RowCancelingEdit" OnRowCommand="Gridview1_RowCommand" OnRowDeleting="Gridview1_RowDeleting" OnRowEditing="Gridview1_RowEditing" OnRowUpdating="Gridview1_RowUpdating" ShowFooter="True" BorderStyle="None" BorderWidth="1px" CellPadding="3" CellSpacing="2" ShowHeaderWhenEmpty="True" Width="100%" CssClass="table table-responsive table-bordered" OnSelectedIndexChanged="Gridview1_SelectedIndexChanged" DataKeyNames="CID">
<Columns>
<asp:TemplateField HeaderText="Transaction ID">
<EditItemTemplate>
<asp:Label ID="lbleditid" runat="server" Text='<%# Bind("CID") %>'></asp:Label>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblid" runat="server" Text='<%# Bind("CID") %>'></asp:Label>
</ItemTemplate>
<HeaderStyle CssClass="hidden-xs" />
<ItemStyle CssClass="hidden-xs" />
</asp:TemplateField>
<asp:TemplateField HeaderText="CCID">
<EditItemTemplate>
<asp:Label ID="lblccid2" runat="server"></asp:Label>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblccid" runat="server" Text='<%# Bind("CCID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Category" SortExpression="Category">
<EditItemTemplate>
<%--<asp:TextBox ID="txtBox_Cat" runat="server" Text='<%# Bind("Category") %>'></asp:TextBox>--%>
<asp:DropDownList ID="ddlCategory" runat="server" >
<asp:ListItem Value="--Select--">--Select--</asp:ListItem>
<asp:ListItem Value="Transportation">Transportation</asp:ListItem>
<asp:ListItem Value="Children">Children </asp:ListItem>
<asp:ListItem Value="Food">Food</asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlCategory1" runat="server">
<asp:ListItem>--Select--</asp:ListItem>
<asp:ListItem>Transportation</asp:ListItem>
<asp:ListItem>Children </asp:ListItem>
<asp:ListItem>Food </asp:ListItem>
</asp:DropDownList>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Category") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Last Edited">
<EditItemTemplate>
<asp:TextBox ID="txtDateTime1" runat="server" Text='<%# Bind("Last_Edited") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtDateTime" runat="server" ToolTip="DD/MM/YYYY"></asp:TextBox>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblDateTime" runat="server" Text='<%# Bind("Last_Edited") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Edit" ShowHeader="False">
<EditItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True" CommandName="Update" Text="Update"></asp:LinkButton>
<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel"></asp:LinkButton>
</EditItemTemplate>
<FooterTemplate>
<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="true" CommandName="AddNew" Text="Add New"></asp:LinkButton>
</FooterTemplate>
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Edit" Text="Edit"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField HeaderText="Delete" ShowDeleteButton="True" ShowHeader="True" />
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="LinkButton3" runat="server" OnClick="PassData">Select</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
WebForm1.aspx.cs
protected void PassData(object sender, EventArgs e)
{
GridViewRow gr = ((sender as LinkButton).NamingContainer as GridViewRow);
Session["Category"] = gr.Cells[1].Text.Trim();
Response.Redirect("AfterUserMthlyExpenses.aspx");
}
WebForm2.aspx
<asp:Label ID="lblPassCategory" runat="server" ></asp:Label>
WebForm2.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//Passing "Category" from previous page
lblPassCategory.Text = Session["Category"].ToString();
}
}

Well, really one should hold off on the passing of the value to the next page until such time you have a working simple answer to select/get the given row that you clicked on right?
Be it a repeater, grid view, list view (details view) etc.?
In asp.net they ALL FOLLOW the same process. You want to have that button click set/move/change to the correct given row that you clicked on. Until you have that “movement” or selection of the row occur, then you will fail at attempting to grab values from that row.
So, looking at this, you have a link button (it could be a asp.net button if want – don’t matter), you need that button to trigger/set/move/cause the row you are working on to change FIRST and BEFORE you attempt to grab data/values from that given row.
The WAY you do this is to add a special command. As noted, this works for list view/grivdview/repeater and MANY more data bound controls.
so what you learn here can apply to just about ANY data aware control (that repeats data).
So, add this to the one link button in the item template:
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="LinkButton3" runat="server"
CommandName = "MyJump"
CommandArgument = '<%# Eval("Category") %>'
>Select</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
So, the INSTANT you add CommandName="Select", then this will cause TWO events of the grid to fire.
OnRowComand:
The row command event will fire. But the row HAS NOT YET changed!
However, since we use CommandArgument and pass "Catagory", then we of course can use the rowcomamnd event, and pick up the CommandArgument value.
So, you can have this code in row command event:
Protected Sub GridView1_RowCommand(sender As Object, e As GridViewCommandEventArgs) Handles GridView1.RowCommand
Debug.Print("row command = " & e.CommandName)
Debug.Print("row arg = " & e.CommandArgument)
If e.CommandName = "MySelect" Then
' do whatever
End If
End Sub
Note how we don't need (you can remove) the on-click event for that button - you use the rowcommand event stub, and pick up the custom command name you passed (MySelect).
You can ALSO trigger the selected row event to fire. This would allow you to use/keep/have your EXISTING code click stub for your button.
However you now MUST change the CommandName from "your custom" name to either;
Select (move the grid pointer)
Edit - trigger edit event
Delete - trigger delete event
However, in your button click (as you have now).
You could try this:
Dim btn As Button = sender
Dim gvRow As GridViewRow = btn.Parent.Parent
Debug.Print("btn row sel = " & gvRow.RowIndex)
Debug.Print("btn argument = " & btn.CommandArgument)
So you can try btn.Parent (that will be the grid cell, and parent again will return the ONE row as you have. From that, you can grab any value out of that row.
eg:
dim myLable as label
myLabel = gvRow.FindControl("Label1")
debug.print myLabel.Text (should return catagory).
Probably most easy to just add a CommandArgument, and pick it up from sender.
Now that you first and foremost verify that you have the correct value, then you can shove that value into session. in fact you can even shove in the whole gvRow into session, and thus pass all of the values of that row to the page you jump to.

Gridview must show Text instead of the Value from the database

I have a gridview that gets the data from a database.
Here is the .NET code. There's a lot of columns, and here the template: Choice is the one I'm talking about.
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" AllowPaging="True" CellPadding="4" DataKeyNames="EmpID" ForeColor="#333333" GridLines="None" style="margin-right: 81px" Width="1174px" >
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:TemplateField HeaderText="Choice" SortExpression="Choice">
<EditItemTemplate>
<asp:DropDownList ID="DropDownChoice" Text='<%# Bind("Choice") %>' runat="server" Width="60px">
<asp:ListItem Text="No" Value="0"></asp:ListItem>
<asp:ListItem Text="Yes" Value="1"></asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblChoice" runat="server" Text='<%# Bind("Choice") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
Here on the EditItemTemplate, the user may edit the said data on the database. Where I can use a drop down list and show the text as No or Yes but the value that will be saved on the database is still 0 and 1.
<EditItemTemplate>
<asp:DropDownList ID="DropDownChoice" Text='<%# Bind("Choice") %>' runat="server" Width="60px">
<asp:ListItem Text="No" Value="0"></asp:ListItem>
<asp:ListItem Text="Yes" Value="1"></asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
I'm having trouble of showing the text No and Yes on the Gridview once it runs. As you can see here is the ItemTemplate code:
<ItemTemplate>
<asp:Label ID="lblChoice" runat="server" Text='<%# Bind("Choice") %>'></asp:Label>
</ItemTemplate>
Please suggest a way/method to show No/Yes on the ItemTemplate/Gridview section once executed. Thanks (let me know if you might need the C# code to bind data on the gridview)
NOTE:
I have tried the RowDataBound event that was answered in this question.
here is the code:
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
System.Data.DataRow dr = ((System.Data.DataRowView)e.Row.DataItem).Row;
if (dr["Choice"].ToString() == "0")
{
((Label)e.Row.FindControl("lblChoice")).Text = "No";
}
else if (dr["Choice"].ToString() == "1")
{
((Label)e.Row.FindControl("lblChoice")).Text = "Yes";
}
}
}
But it doesn't work. Am I missing something? Do I have to include something in the <ItemTemplate> tag ?

As far as I understood, you can either use Render Property function or row data bound event.
RenderProperty Function
RowDataBound Event
Both answers are from this question
Edit: As you asked how to call the RowDataBound event, it's added to the GridView tag like this:
<asp:GridView ID="GridView1" runat="server" OnRowDataBound="GridView1_RowDataBound"></asp:GridView>

Without using RowBound event you can do this
<ItemTemplate>
<asp:Label ID="lblChoice" runat="server"
Text='<%# Bind("Choice").Equals("1")? "Yes" : "No" %>'></asp:Label>
</ItemTemplate>

reading values from gridview template field in asp.net

Here is a code of template field in gridview . i want to get value of this field in string using c# code.
<asp:TemplateField HeaderText="Status" SortExpression="Status">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Status") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:DropDownList ID="DropDownList2" runat="server">
<asp:ListItem Value="P"></asp:ListItem>
<asp:ListItem Value="L"></asp:ListItem>
<asp:ListItem Value="A"></asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
i tried the following code but its not working .
here is my code for reading value.
string str = gridview1.Rows[0].Cells[0].Text.ToString();
but its returning empty string. how can I get selected value.

You can't find the dropdown selected value like this. You need to find the control first using FindControl method:-
DropDownList DropDownList2 = (DropDownList)gridview1.Rows[0].Cells[0]
.FindControl("DropDownList2");
string str = DropDownList2.SelectedValue;

How to make checbox checked or uncheked in gridview editmode

i have made a gridview which has many columns and the editmode , some are text and dropdown list are are working perfect .
How can i assign value to a Checkbox to make it Checked or Unchecked?
The value against which i want to do is Yes / No.
So i am having trouble doing this.
My Gridview: Just pasting portion of it as its too big.
<asp:TemplateField HeaderText="CUpdate">
<ItemTemplate >
<asp:Label ID="Label6" runat="server" Text='<%# Eval("CUpdate") %>' ></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtCupdate" Text='<%# Eval("CUpdate") %>' ></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Email">
<ItemTemplate >
<asp:Label ID="Label6" runat="server" Text='<%# Eval("Email") %>' ></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:CheckBoxList ID="checkEmail" runat="server">
<%--HOW TO MAKE THIS CHECKED OR UNCHECKED ? when i have values Yes / NO--%>
</asp:CheckBoxList>
</EditItemTemplate>
</asp:TemplateField>
Update
If i make the above as :
<EditItemTemplate>
<asp:CheckBoxList ID="checkEmail" selectedvalue='<%# Eval("Email") %>' runat="server">
<asp:ListItem Value="Yes">Yes</asp:ListItem>
</asp:CheckBoxList>
</EditItemTemplate>
In this case i do get checkbox checked when there us Yes , but in case on NO it wont run possible error as there is no value 'NO' to select in the checboxlist .Any solution.
Thank you

Your CheckBoxList needs to have all the posible values like so..
<asp:CheckBoxList ID="checkEmail" selectedvalue='<%# Eval("Email") %>' runat="server">
<asp:ListItem Value="Yes">Yes</asp:ListItem>
<asp:ListItem Value="No">No</asp:ListItem>
</asp:CheckBoxList>
Although i don't understand why you want to use a CheckBoxList instead of just 1 checkbox like so..
<asp:CheckBox runat="server" ID="checkEmail" Checked = '<%# Eval("Email").ToString().Equals("yes", StringComparison.OrdinalIgnoreCase) %>' />

Get gridview values from code behind

I want to get the value of a hidden field in a grid view from code-behind, but not to be used in the _RowDataBound or any other similar method. Here is my present code (it is a shopping cart scenario):
<asp:GridView ID="gvShoppingCart"
runat="server"
AutoGenerateColumns="False"
AllowPaging="True"
DataKeyNames="ID"
ShowFooter="true">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:HiddenField ID="lblProductID" runat="server" Text='<%# Eval("ProductID") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Product">
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server"
NavigateUrl='<%# Eval("ProductID", "product_details.aspx?id={0}") %>'
Text='<%# GetProduct(Eval("ProductID")) %>'></asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Quantity">
<ItemTemplate>
<asp:TextBox ID="txtQuantity" runat="server" Width="35" CssClass="input" onkeypress="return isNumberKey(event)" AutoPostBack="true" ontextchanged="txtQuantity_TextChanged"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
For the sake of brevity I removed certain fields since they are there only for the display. The Quantity field is there for the user to input a number to add a number of products to his cart. I wish to access the lblProductID label in the _TextChanged event. In this same event, I tried
Label lblProductID = (Label)gvShoppingCart.FindControl("lblProductID");
but it didn't work and returns only a null value. What is the solution?

For each row in your GridView there is a HiddenField for the ProductID.
You can access the HiddenField of a row (in the example below the first row) by using the following code (assuming your HiddenField is in the first cell):
HiddenField hiddenFieldProductID =
(HiddenField)gvShoppingCart.Rows[0].Cells[0].FindControl("lblProductID");
string productID = hiddenFieldProductID.Value
// Do something with the value
Hope, this helps.

Try to replace the HiddenField to a label or a textbox and set the visible attribute to false.
I had tried this before and it works.