ShowHideGridViewColumnsServer.aspx.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Text;

public partial class ShowHideGridViewColumnsServer : System.Web.UI.Page
{
    #region Properties & Fields

    /// <summary>
    /// List of column names
    /// </summary>
    List<string> columnNames = new List<string>() { "Id", "Description", "Assigned To", "Status" };

    private List<int> hiddenColumnIndexes
    {
        get
        {
            return ViewState["hiddenColumnIndexes"] == null ? new List<int>() : (List<int>)ViewState["hiddenColumnIndexes"];
        }
        set
        {
            ViewState["hiddenColumnIndexes"] = value;
        }
    }

    #endregion

    #region Page Load

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            _sampleData = null;

            // Populate the GridView
            this.GridView1.DataSource = _sampleData;
            this.GridView1.DataBind();

            hiddenColumnIndexes = new List<int>();
        }
    }

    #endregion

    #region Control Events

    protected void GridView1ShowHideColumns_SelectedIndexChanged(object sender, EventArgs e)
    {
        if(this.GridView1ShowHideColumns.SelectedIndex > 0)
        {