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How do I Pass Multiple Selected Datagrid Values to Another Page in asp.net?

I have multiple asp.net data grids that a user can select a checkbox to the corresponding value that they want, put in the amount they want in a textbox and submit the request. How do I show what values they requested with the amount on the next page? I can do this with a session I believe but I'm having a hard time finding good examples for something like this. Since they can select multiple values I can't use a query string right? I'm using VB.net but if you answer in c# that's fine. Thanks!
<asp:GridView ID="flexGridView" DataKeyNames="ID" runat="server" AutoGenerateColumns="False" DataSourceID="FormSqlDataSource" CssClass="gridView" ClientIDMode="Static">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="flexCheckBoxList" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Form" ShowHeader="False" />
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" Visible="False" />
<asp:BoundField DataField="Category" HeaderText="Category" SortExpression="Category" ShowHeader="False" Visible="False" />
<asp:TemplateField Visible="false">
<ItemTemplate>
<asp:Label ID="lblEmail" runat="server" Text='<%# Eval("Email")%>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Qty" >
<ItemTemplate>
<asp:TextBox ID="flexTextBox" runat="server" Width="40" ></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

You can use Session or query string, but I would recommend Session, as there are limitations on the length of a query string, especially if you are not sure how many check boxes might be checked.
Use the OnCheckChanged event of the check box control and set AutoPostBack to true in your template field, like this:
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="flexCheckBoxList" runat="server"
AutoPostBack="True" OnCheckedChanged="Check_Clicked" />
</ItemTemplate>
</asp:TemplateField>
protected void Check_Clicked(Object sender, EventArgs e)
{
// Store the check box name, ID or whatever unique value you want in Session here
CheckBox theCheckBox = sender as CheckBox;
// Was the check box found?
if(theCheckBox != null)
{
// Store in Session
Session["CheckBoxValue"] = theCheckBox.SomePropertyValue;
}
}
Then in the Page_Load of your redirect page, you will need to read out the Session value for the checked check boxes.

Populating a gridview column with an object list

I have a gridview of messages that is populated by an object class. There is a list in the object so that for each message, there is a list of recipients. Problem is, right now the gridview is only displaying "Person[]" for each message. I want it to display as a count of the recipients in the list.
Any help would be appreciated.
HTML
<asp:GridView
ID="grdMsgSent"
runat="server"
CssClass="cellSpacing"
OnRowDataBound="grdMsgSent_RowDataBound"
AllowSorting="True"
EmptyDataText="You have not sent any messages."
AllowPaging="True"
PageSize="6"
OnPageIndexChanging="grdMsgSent_PageIndexChanging"
OnSorting="grdMsgSent_Sorting"
AutoGenerateColumns="False">
<Columns>
<asp:BoundField DataField="Recipients" HeaderText="Recipients" />
</Columns>
</asp:GridView>
C#
grdMsgSent.DataSource = listSentMsg.List;
grdMsgSent.DataBind();

For example, if you have a data column name called UserID, you can populate in grid view using Eval (DataBinding Expression). So your code will be like this in aspx page,
<asp:TemplateField HeaderText="UserID" Visible="false">
<ItemTemplate>
<asp:Label ID="lblUserID" runat="server" Text='<%# Eval("UserID") %>' />
</ItemTemplate>
</asp:TemplateField>
In C# Code Behind,
DataTable dataTable = new DataTable();
DataColumn dataColumn;
dataColumn = new DataColumn("UserID");

You can use a templatefield:
For array[], do this:
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%#Eval("Recipients.Length") %>' />
</ItemTemplate>
</asp:TemplateField>
For List, do this:
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%#Eval("Recipients.Count") %>' />
</ItemTemplate>
</asp:TemplateField>

How to define number of rows of GridView at runtime in code behind using C#

I need to develop such a program in which the GridView's rows should be decided at run time.
i.e. I have a table in database called dealer capacity.
Dealer_ID Capacity
D0001 5
Now when the Dealer D00001 is selected from combo box the number of rows in grid view should be 5. I want to use the template field also.
My code for GridView is:
<asp:GridView ID="grdlicence" runat="server" DataKeyNames="Version_id" GridLines="None" BorderStyle="Solid" AutoGenerateColumns="false" AllowSorting="true"
CssClass="mGrid table"
PagerStyle-CssClass="pgr"
AlternatingRowStyle-CssClass="alt" >
<Columns>
<asp:BoundField DataField="Version_name" ItemStyle-CssClass="uppercase" ItemStyle-Width="150px" HeaderText="Version" HeaderStyle-HorizontalAlign="Left" />
<asp:BoundField DataField="Version_id" Visible="false" HeaderText="Version" HeaderStyle-HorizontalAlign="Left" />
<asp:TemplateField HeaderText="Price">
<ItemTemplate>
<center><asp:TextBox ID="txtprice" CssClass="alignments TextStyle" MaxLength="5" runat="server" ></asp:TextBox></center>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Licence Id">
<ItemTemplate>
<center><asp:TextBox ID="txtlicenceid" CssClass="alignments uppercase" runat="server" ></asp:TextBox></center>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Purchase Date">
<ItemTemplate>
<center><asp:TextBox ID="txtpurchasedate" onfocus="showCalendarControl(this);" CssClass="alignments TextStyle" runat="server"></asp:TextBox></center>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Expiry Date">
<ItemTemplate>
<center><asp:TextBox ID="txtexpirydate" onfocus="showCalendarControl(this);" CssClass="alignments TextStyle" runat="server"></asp:TextBox></center>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Upload File">
<ItemTemplate>
<center><asp:FileUpload ID="fileUpload" runat="server" /></center>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

You need to define PageSize for your GridView and remember to set AllowPaging to true for the GridView
GridView.PageSize Property
Gets or sets the number of records to display on a page in a GridView
control.
The default is 10.
You may see this article: GridView Paging Sample in ASP.NET

You can use the linq Take() and pass the number as parameter.
Updated according to the comment, use following code.
grdlicence.DataSourse= ds.Take(5);
grdlicence.DataBind();

Conditional HyperLink in GridView?

I have a gridview with a hyperlink:
<asp:GridView ID="gvEmployees" runat="server" AutoGenerateColumns="False"
CssClass="table table-hover table-striped" GridLines="None" >
<Columns>
<asp:TemplateField HeaderText="Name" SortExpression="EmployeName">
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server"
Text='<%# Bind("EmployeName") %>' ></asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="ID" SortExpression="EmployeID" Visible="False">
<ItemTemplate>
<asp:Label ID="lblID" runat="server" Text='<%# Bind("EmployeID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
However, it should only appear as a hyperlink if the employeeID is that of the logged in employee.
I can do all that, but what I do not know is how to make the hyperlink look like a Label. It's easy to have it not link anywhere, but I do not know how to make it look like a label.
Thanks

I believe if you set Enabled="false" it does. If it does not, then the only way to do that is put both a HyperLink and Label in the cell, and show the link when appropriate, and the label when appropriate, hiding the other one (which can be easily done in RowDataBound event).

How to use compare validator with a set of different values?

Q:
I have a gridview contains a textbox as a template field :
the aspx:
<asp:GridView Width="100%" ID="gv_Evaluation" CssClass="datatable" AllowSorting="True"
runat="server" AutoGenerateColumns="False" AllowPaging="True" GridLines="None"
OnRowDataBound="gv_Evaluation_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="serial">
<ItemTemplate>
<asp:Label ID="lblSerial" runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="activity type" DataField="activityType" />
<asp:BoundField HeaderText="weight" DataField="activityWeight" />
<asp:TemplateField HeaderText="evaluation">
<ItemTemplate>
<telerik:RadTextBox ID="txt_evaluateWeights" runat="server" AutoPostBack="True"
OnTextChanged="txt_evaluateWeights_TextChanged"></telerik:RadTextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txt_evaluateWeights" Display="Dynamic" ErrorMessage="*" SetFocusOnError="True"></asp:RequiredFieldValidator>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<RowStyle VerticalAlign="Top" CssClass="row" />
</asp:GridView>
the weight column contains the following numbers[50,10,10,10,5,5,10]
What I wanna to do is:
Validate the data entry when the user enters the data in the txt_evaluateWeights Where it must be less than or equal the meeting one in the weight column. I do that in server side. But I wanna to do that client side. I tried to use the compare validator but it doesn't suit my case because each time i compare with a different value, according to the weight column.

You can use the CustomValidator class and set the ClientValidationFunction property to use clientside validation
see MSDN documentation