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Get checked item in gridView (ASP.Net) and store in session

This is a snippet I use to get the checked items in an ASP.Net GridView and store them in the session for later retrieval. I use this so I don't lose track of the checked items during paging

Submitted By: PsychoCoder

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Views: 8,760

Language: C#

Last Modified: March 25, 2008

Instructions: Need a reference to the System.Collections Namespace. Pass the method the name of your GridView, and the name of your CheckBox column in your GridView.

Snippet

//Namespaces needed
using System.Collections;
/// <summary>
/// method to retrieve all the selected items in the GridView
/// NOTE: This is so we dont lose track of them while paging
/// </summary>
private void GetCheckedItems(string crtl,GridView grdView)
{
//instantiate new ArrayList to hold our checked items
ArrayList checkedItems = new ArrayList();
CheckBox chk;
string chkBoxIndex = string.Empty;
//loop through each row in the GridView
foreach (GridViewRow row in grdView.Rows)
{
//get the index of the current CheckBox
chkBoxIndex = (string)grdView.DataKeys[row.RowIndex].Value.ToString();
chk = (CheckBox)row.FindControl(ctrl);
//add ArrayList to Session is if doesnt already exist
if (!(Session["CheckedItems"] == null))
{
checkedItems = (ArrayList)Session["CheckedItems"];
}
//now see if the current CheckBox is checked
if (chk.Checked)
{
//see if the current value is in the Session, if not add it
if (!(checkedItems.Contains(chkBoxIndex)))
{
//add to the list
checkedItems.Add(chkBoxIndex);
}
else
{
//remove from list since it's unchecked
checkedItems.Remove(chkBoxIndex);
}
}
}
//update Session with the list of checked items
Session["CheckedItems"] = checkedItems;
}

Copy & Paste

//Namespaces needed
using System.Collections;

/// <summary>
/// method to retrieve all the selected items in the GridView
/// NOTE: This is so we dont lose track of them while paging
/// </summary>
private void GetCheckedItems(string crtl,GridView grdView)
{
    //instantiate new ArrayList to hold our checked items
    ArrayList checkedItems = new ArrayList();
    CheckBox chk;
    string chkBoxIndex = string.Empty;
    //loop through each row in the GridView
    foreach (GridViewRow row in grdView.Rows)
    {
        //get the index of the current CheckBox
        chkBoxIndex = (string)grdView.DataKeys[row.RowIndex].Value.ToString();
        chk = (CheckBox)row.FindControl(ctrl);
        //add ArrayList to Session is if doesnt already exist
        if (!(Session["CheckedItems"] == null))
        {
            checkedItems = (ArrayList)Session["CheckedItems"];
        }

//now see if the current CheckBox is checked
        if (chk.Checked)
        {
            //see if the current value is in the Session, if not add it
            if (!(checkedItems.Contains(chkBoxIndex)))
            {
                //add to the list
                checkedItems.Add(chkBoxIndex);
            }
            else
            {
                //remove from list since it's unchecked
                checkedItems.Remove(chkBoxIndex);
            }
        }

}
    //update Session with the list of checked items
    Session["CheckedItems"] = checkedItems;
}