Export ASP.Net GridView containing accented letters to Excel using C# and VB.Net

Hi comunidadmexi...,

Refer below code.

HTML

<asp:GridView runat="server" ID="GridView1" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="Id" HeaderText="Id" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
    </Columns>
</asp:GridView>
<br />
<asp:Button Text="Export" runat="server" OnClick="OnExport" />

Namespaces

C#

using System.Data;
using System.IO;

VB.Net

Imports System.Data
Imports System.IO

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        this.BindGrid();
    }
}

private void BindGrid()
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                    new DataColumn("Name", typeof(string)),
                    new DataColumn("Country",typeof(string)) });
    dt.Rows.Add(1, "Frédérique Citeaux", "Finland");
    dt.Rows.Add(2, "Mudassar Khan", "India");
    dt.Rows.Add(3, "Martine Rancé", "France");
    dt.Rows.Add(4, "Lúcia Carvalho", "Brazil");
    this.GridView1.DataSource = dt;
    this.GridView1.DataBind();
}

protected void OnExport(object sender, EventArgs e)
{
    try
    {
        Response.Clear();
        Response.Buffer = true;
        Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.xls");
        Response.Charset = "";
        Response.ContentType = "application/vnd.ms-excel";
        using (StringWriter sw = new StringWriter())
        {
            HtmlTextWriter hw = new HtmlTextWriter(sw);
            this.GridView1.AllowPaging = false;
            this.BindGrid();
            this.GridView1.HeaderRow.BackColor = System.Drawing.Color.White;
            foreach (TableCell cell in GridView1.HeaderRow.Cells)
            {
                cell.BackColor = GridView1.HeaderStyle.BackColor;
            }
            foreach (GridViewRow row in GridView1.Rows)
            {
                row.BackColor = System.Drawing.Color.White;
                foreach (TableCell cell in row.Cells)
                {
                    if (row.RowIndex % 2 == 0)
                    {
                        cell.BackColor = System.Drawing.Color.Green;
                        cell.ForeColor = System.Drawing.Color.White;
                    }
                    else
                    {
                        cell.BackColor = System.Drawing.Color.Blue;
                        cell.ForeColor = System.Drawing.Color.White;
                    }
                    cell.CssClass = "textmode";
                }
            }
            this.GridView1.RenderControl(hw);
            string style = "<style> .textmode { } </style>";
            Response.Write(style);
            Response.Output.Write(sw.ToString());
            Response.Flush();
            Response.End();
        }
    }
    catch (Exception ex)
    {

    }
}

public override void VerifyRenderingInServerForm(Control control)
{
    /* Verifies that the control is rendered */
}

VB.Net

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Me.BindGrid()
    End If
End Sub

Private Sub BindGrid()
    Dim dt As DataTable = New DataTable()
    dt.Columns.AddRange(New DataColumn() _
    {
        New DataColumn("Id"),
        New DataColumn("Name"),
        New DataColumn("Country")
    })
    dt.Rows.Add(1, "Frédérique Citeaux", "Finland")
    dt.Rows.Add(2, "Mudassar Khan", "India")
    dt.Rows.Add(3, "Martine Rancé", "France")
    dt.Rows.Add(4, "Lúcia Carvalho", "Brazil")
    Me.GridView1.DataSource = dt
    Me.GridView1.DataBind()
End Sub

Protected Sub OnExport(sender As Object, e As EventArgs)
    Try
        Response.Clear()
        Response.Buffer = True
        Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.xls")
        Response.Charset = ""
        Response.ContentType = "application/vnd.ms-excel"
        Using sw As New StringWriter()
            Dim hw As HtmlTextWriter = New HtmlTextWriter(sw)
            Me.GridView1.AllowPaging = False
            Me.BindGrid()
            Me.GridView1.HeaderRow.BackColor = Drawing.Color.White
            For Each cell As TableCell In GridView1.HeaderRow.Cells
                cell.BackColor = GridView1.HeaderStyle.BackColor
            Next

            For Each row As GridViewRow In GridView1.Rows
                row.BackColor = Drawing.Color.White
                For Each cell As TableCell In row.Cells
                    If row.RowIndex Mod 2 = 0 Then
                        cell.BackColor = Drawing.Color.Green
                        cell.ForeColor = Drawing.Color.White
                    Else
                        cell.BackColor = Drawing.Color.Blue
                        cell.ForeColor = Drawing.Color.White
                    End If
                    cell.CssClass = "textmode"
                Next
            Next
            Me.GridView1.RenderControl(hw)
            Dim style As String = "<style> .textmode { } </style>"
            Response.Write(style)
            Response.Output.Write(sw.ToString())
            Response.Flush()
            Response.End()
        End Using
    Catch ex As Exception

    End Try
End Sub
Public Overrides Sub VerifyRenderingInServerForm(ByVal control As Control)
End Sub

Screenshot