Solved

Export to excel with c# custom Control

Posted on 2010-11-22
3
839 Views
Last Modified: 2012-05-10


I want to create custom Button control in c#.On Click on the Button the data in gridview will be Exported To Excell.
i have tried.
Below are some code
protected override void OnClick(EventArgs e)
        {
            base.OnClick(e);

            foreach (Control c in this.Page.Controls)
            {
                String s = c.GetType().ToString();
                if (c is GridView)
                {
                    GridView gv = (GridView)c;
                    if (gv != null)
                    {

                        ExportToExcell(gv);
                    }
                }
            }          
        }

        public void ExportToExcell(GridView gv)
        {
            string attachment = "attachment; filename=Data.xls";
            Context.Response.ClearContent();
            Context.Response.AddHeader("content-disposition", attachment);
            Context.Response.ContentType = "application/ms-excel";

            StringWriter sw = new StringWriter();
            HtmlTextWriter htw = new HtmlTextWriter(sw);
            HtmlForm frm = new HtmlForm();

            gv.Parent.Controls.Add(frm);
            frm.Attributes["runat"] = "server";
            frm.Controls.Add(gv);
            frm.RenderControl(htw);
            Context.Response.Write(sw.ToString());
            Context.Response.End();
        }
0
Comment
Question by:dynamicweb09
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 3

Expert Comment

by:abdkhlaif
ID: 34187582
one way to do this is first to convert your gridview to a DataTable using the attached code then use the ExportToExcel method at (just copy & paste):
http://forums.asp.net/p/975095/1237999.aspx#1237999 
to convert the DataTable to Excel

protected void Button2_Click(object sender, EventArgs e)
{
	DataTable dt = new DataTable();

	// copy columns from the gridview to dt:
	foreach (TableCell tc in GridView1.HeaderRow.Cells)
		dt.Columns.Add(tc.Text);

	// import rows from gridview to dt:
	foreach (GridViewRow gvr in GridView1.Rows)
	{
		DataRow nr = dt.NewRow();
		for (int c = 0; c < dt.Columns.Count; c++)
			nr[c] = gvr.Cells[c].Text;
		
		dt.Rows.Add(nr);
	}

	// convert dt to Excel file:
	ExportToExcel(dt);
}

Open in new window

0
 
LVL 1

Author Comment

by:dynamicweb09
ID: 34187617
how will i write all the code within custom control.
0
 
LVL 3

Accepted Solution

by:
abdkhlaif earned 500 total points
ID: 34194552
since you are creating a custom button, inherit from System.Web.UI.WebControls.Button which already has OnClick and Page members. Add a new member to point to the GridView that the button will export to Excel. Then, override the constructor to set the GridView member, then override the OnClick to convert the GridView to a DataTable and call ExportToExcel which will use the Page member to write the Excel file as a response.

to use this custom control in your web application, add the following code to Page_Load to create & add the control to your page:

ExportToExcelButton c = new ExportToExcelButton(GridView1);
c.Text = "Export to Excel";
Page.FindControl("form1").Controls.Add(c);

The full code of the custom control is attached:
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// Summary description for ExportToExcelButton
/// </summary>
public class ExportToExcelButton : System.Web.UI.WebControls.Button
{
	private GridView gridview;
	
	public ExportToExcelButton(GridView gridview1)
	{
		gridview = gridview1;
	}

	protected override void OnClick(EventArgs e)
	{
		DataTable dt = new DataTable();

		foreach (TableCell tc in gridview.HeaderRow.Cells)
			dt.Columns.Add(tc.Text);

		foreach (GridViewRow gvr in gridview.Rows)
		{
			DataRow nr = dt.NewRow();
			for (int c = 0; c < dt.Columns.Count; c++)
				nr[c] = gvr.Cells[c].Text;

			dt.Rows.Add(nr);
		}

		ExportToExcel(dt);
	}

	protected void ExportToExcel(DataTable dataTable)
	{
		// We can't do anything if there's no data...
		if ((dataTable == null) || (dataTable.Rows.Count <= 0))
			return;

		// Set up the Response object...
		Page.Response.BufferOutput = false;
		Page.Response.Charset = string.Empty;
		Page.Response.Clear();
		Page.Response.ClearContent();
		Page.Response.ClearHeaders();

		Page.Response.ContentType = "application/vnd.ms-excel";

		// Open the document OVER this window:
		string contentDisposition = "inline; filename=ExcelFile.xls";
		Page.Response.AppendHeader("content-disposition", contentDisposition);

		// Create a table HTML tag...
		string textOutput =
		"<table border='1' bordercolor='black' rules='all' " +
		"style='BORDER: 1px double; BORDER-COLLAPSE: collapse;'>\r\n";
		Page.Response.Write(textOutput);

		///////////////////////////////////////////////////////////////////////////
		// Write out the column headers...
		///////////////////////////////////////////////////////////////////////////
		textOutput = "<tr height=17 style='height:12.75pt'>\r\n";
		for (int i = 0; i < dataTable.Columns.Count; i++)
		{
			textOutput += string.Format(
			System.Globalization.CultureInfo.InvariantCulture,
			"<th align='left'>{0}</th>",
			dataTable.Columns[i].ColumnName);
		}
		textOutput += "</tr>\r\n";
		Page.Response.Write(textOutput);

		///////////////////////////////////////////////////////////////////////////
		// Write out each row of the DataTable...
		///////////////////////////////////////////////////////////////////////////
		textOutput = string.Empty;
		for (int i = 0; i < dataTable.Rows.Count; i++)
		{
			System.Data.DataRow dataRow = dataTable.Rows[i];
			textOutput = "<tr height=17 style='height:12.75pt'>\r\n";

			// Loop through the columns for each row and grab the values...
			for (int j = 0; j < dataRow.Table.Columns.Count; j++)
			{
				string dataRowText = dataRow[j].ToString().Trim();

				// Remove any tabs, carriage returns, or newlines from the value...
				dataRowText = dataRowText.Replace("\t", " ");
				dataRowText = dataRowText.Replace("\r", string.Empty);
				dataRowText = dataRowText.Replace("\n", " ");

				textOutput += string.Format(
				System.Globalization.CultureInfo.InvariantCulture,
				"<td align='left' style='mso-number-format:\\@;'>{0}</td>",
				dataRowText);
			}

			textOutput += "</tr>\r\n";
			Page.Response.Write(textOutput);
		}

		// Close the HTML table tag...   
		textOutput = "</table>\r\n";
		Page.Response.Write(textOutput);

		// Close the Response stream...
		Page.Response.Flush();
		Page.Response.Close();
		Page.Response.End();
	}
}

Open in new window

0

Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Article by: Najam
Having new technologies does not mean they will completely replace old components.  Recently I had to create WCF that will be called by VB6 component.  Here I will describe what steps one should follow while doing so, please feel free to post any qu…
This article describes a simple method to resize a control at runtime.  It includes ready-to-use source code and a complete sample demonstration application.  We'll also talk about C# Extension Methods. Introduction In one of my applications…
Are you ready to implement Active Directory best practices without reading 300+ pages? You're in luck. In this webinar hosted by Skyport Systems, you gain insight into Microsoft's latest comprehensive guide, with tips on the best and easiest way…

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question