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ASP.Net/C# - Sorting GridView code working how do I keep checkboxes checked?

Posted on 2009-03-31
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1,982 Views
Last Modified: 2012-05-06
Hello all I have all my gridviews sorting perfectly, however what happens is when I click on the sorting I lose all my checked checkboxes in my grid.  Any idea how I can keep them checked?  Here is what I have below as an example:


protected void EDIAccountData_Sorting(object sender, GridViewSortEventArgs e)
        {
            DataSet dsAccountData = (DataSet)Session["dsAccountData"];
            DataTable dtAccountData = dsAccountData.Tables[0];
 
            if (dtAccountData != null)
            {
                DataView dataView = new DataView(dtAccountData);
                dataView.Sort = e.SortExpression + " " + GetSortDirection(e.SortExpression);
 
                EDIAccountData.DataSource = dataView;
                EDIAccountData.DataBind();
            }
        }
 
 private string GetSortDirection(string column)
        {
 
            // By default, set the sort direction to ascending.
            string sortDirection = "ASC";
 
            // Retrieve the last column that was sorted.
            string sortExpression = Session["SortExpression"] as string;
 
            if (sortExpression != null)
            {
                // Check if the same column is being sorted.
                // Otherwise, the default value can be returned.
                if (sortExpression == column)
                {
                    string lastDirection = Session["SortDirection"] as string;
                    if ((lastDirection != null) && (lastDirection == "ASC"))
                    {
                        sortDirection = "DESC";
                    }
                }
            }
 
            // Save new values in ViewState.
            Session["SortDirection"] = sortDirection;
            Session["SortExpression"] = column;
 
            return sortDirection;
        }
 
ASPX PAGE:
 <asp:GridView ID="EDIAccountData" Width="650px" runat="server" CellPadding="4"
                ForeColor="#333333" Font-Size="Small" GridLines="None" AllowSorting="true" AllowPaging="false"  
                OnSorting="EDIAccountData_Sorting" AutoGenerateColumns="False" DataKeyNames="CUS_Parent">
                <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
                <RowStyle BackColor="#76B0F0" ForeColor="#333333" />
                <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
                <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
                <HeaderStyle VerticalAlign="Bottom" HorizontalAlign="Left" BackColor="#3D6592" Font-Bold="True" ForeColor="White" />
                <AlternatingRowStyle BackColor="White" />
                <Columns>
                    <asp:TemplateField>
                        <ItemTemplate>
                            <asp:CheckBox runat="server" ID="AcctCheckBox" AutoPostBack="true" OnCheckedChanged="AcctCheckBox_CheckedChanged" />
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:BoundField DataField="CUS_Parent" HeaderStyle-Width="125px" ItemStyle-Width="125px" HeaderText="Parent Account" SortExpression="CUS_Parent" />
                    <asp:BoundField DataField="Parent_Name" HeaderStyle-Width="250px" ItemStyle-Width="250px" HeaderText="Customer Name" SortExpression="Parent_Name" />
                    <asp:BoundField DataField="Billrun" HeaderStyle-Width="75px" ItemStyle-Width="75px" HeaderText="Billrun" SortExpression="Billrun" />
                    <asp:BoundField DataField="folder" HeaderStyle-Width="100px" ItemStyle-Width="100px" HeaderText="Vendor" SortExpression="folder" />
                    <asp:BoundField DataField="Map_Version" HeaderStyle-Width="100px" ItemStyle-Width="100px" HeaderText="Map Version" SortExpression="Map_Version" />
                </Columns>
            </asp:GridView>

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Question by:sbornstein2
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3 Comments
 
LVL 3

Accepted Solution

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JenniQ earned 500 total points
ID: 24033380
What you need to do is subscribe to a GridView event. Create a delegate event handler that will look at all the checked fields and then assign their "checked" value to... well... "checked"  =P

GridView Events

Sorting:: Occurs when the hyperlink to sort a column is clicked, but before the GridView control handles the sort operation

RowCreated: Occurs when a row is created in a GridView control.

RowDataBound: Occurs when a data row is bound to data in a GridView control.

Here are three options that might work for ya.

And here is the code sample that you could edit to fufill you every desire:

Occurs when a data row is bound to data in a GridView control (of course you'll have to edit it to look at the isChecked property and do the assignment)

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Data" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  protected void TaskGridView_Sorting(object sender, GridViewSortEventArgs e)
  {

    //Retrieve the table from the session object.
    DataTable dt = Session["TaskTable"] as DataTable;

    if (dt != null)
    {

      //Sort the data.
      dt.DefaultView.Sort = e.SortExpression + " " + GetSortDirection(e.SortExpression);
      TaskGridView.DataSource = Session["TaskTable"];
      TaskGridView.DataBind();
    }

  }

  private string GetSortDirection(string column)
  {

    // By default, set the sort direction to ascending.
    string sortDirection = "ASC";

    // Retrieve the last column that was sorted.
    string sortExpression = ViewState["SortExpression"] as string;

    if (sortExpression != null)
    {
      // Check if the same column is being sorted.
      // Otherwise, the default value can be returned.
      if (sortExpression == column)
      {
        string lastDirection = ViewState["SortDirection"] as string;
        if ((lastDirection != null) && (lastDirection == "ASC"))
        {
          sortDirection = "DESC";
        }
      }
    }

    // Save new values in ViewState.
    ViewState["SortDirection"] = sortDirection;
    ViewState["SortExpression"] = column;

    return sortDirection;
  }

  protected void Page_Load(object sender, EventArgs e)
  {

    if (!Page.IsPostBack)
    {

      // Create a new table.
      DataTable taskTable = new DataTable("TaskList");

      // Create the columns.
      taskTable.Columns.Add("Id", typeof(int));
      taskTable.Columns.Add("Description", typeof(string));

      //Add data to the new table.
      for (int i = 0; i < 10; i++)
      {
        DataRow tableRow = taskTable.NewRow();
        tableRow["Id"] = i;
        tableRow["Description"] = "Task " + (10 - i).ToString();
        taskTable.Rows.Add(tableRow);
      }

      //Persist the table in the Session object.
      Session["TaskTable"] = taskTable;

      //Bind the GridView control to the data source.
      TaskGridView.DataSource = Session["TaskTable"];
      TaskGridView.DataBind();

    }

  }

</script>

<html >
<head runat="server">
    <title>Sorting example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

      <asp:GridView ID="TaskGridView" runat="server"
        AllowSorting="true"
        OnSorting="TaskGridView_Sorting" >
      </asp:GridView>

    </div>
    </form>
</body>
</html>


Hope this helps!!

-- jq
0
 

Author Closing Comment

by:sbornstein2
ID: 31565040
thanks so much for the great response and example.
0
 
LVL 3

Expert Comment

by:JenniQ
ID: 24051717
I'm glad I could have been of service! Good luck in the future.

-- jq
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