using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;

public class EmptyGridView : GridView
{
        #region Properties

        /// <summary>
        /// Enable or Disable generating an empty table if no data rows in source
        /// </summary>
        [
        Description("Enable or disable generating an empty table with headers if no data rows in source"),
        Category("Misc"),
        DefaultValue("true"),
        ]
        public bool ShowEmptyTable
        {
                get
                {
                        object o = ViewState["ShowEmptyTable"];
                        return (o != null ? (bool)o : true);
                }
                set
                {
                        ViewState["ShowEmptyTable"] = value;
                }
        }

        /// <summary>
        /// Get or Set Text to display in empty data row
        /// </summary>
        [
        Description("Text to display in empty data row"),
        Category("Misc"),
        DefaultValue(""),
        ]
        public string EmptyTableRowText
        {
                get
                {
                        object o = ViewState["EmptyTableRowText"];
                        return (o != null ? o.ToString() : "");
                }
                set
                {
                        ViewState["EmptyTableRowText"] = value;
                }
        }

        #endregion


        protected override int CreateChildControls(System.Collections.IEnumerable dataSource, bool dataBinding)
        {
                int numRows = base.CreateChildControls(dataSource, dataBinding);

                //no data rows created, create empty table if enabled
                if (numRows == 0 && ShowEmptyTable)
                {
                        //create table
                        Table table = new Table();
                        table.ID = this.ID;

                        //create a new header row
                        GridViewRow row = base.CreateRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);

                        //convert the exisiting columns into an array and initialize
                        DataControlField[] fields = new DataControlField[this.Columns.Count];
                        this.Columns.CopyTo(fields, 0);
                        this.InitializeRow(row, fields);
                        table.Rows.Add(row);

                        //create the empty row
                        row = new GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal);
                        TableCell cell = new TableCell();
                        cell.ColumnSpan = this.Columns.Count;
                        cell.Width = Unit.Percentage(100);
                        cell.Controls.Add(new LiteralControl(EmptyTableRowText));
                        row.Cells.Add(cell);
                        table.Rows.Add(row);

                        this.Controls.Add(table);
                }

                return numRows;
        }
}