asp.net vb.net export dataset to excel

You have to bind the DataSet to DataGrid or GridView. Then you can use the following code to download as excel sheet.

DataGrid dg = new DataGrid();
                    dg.HeaderStyle.HorizontalAlign = HorizontalAlign.Center;
                    dg.HeaderStyle.Font.Bold = true;
 
                    dg.DataSource = ds.Tables[0];
                    dg.DataBind();
 
                    Response.Clear();
                    Response.Buffer = true;
                    Response.ContentType = "application/vnd.ms-excel";
                    Response.AddHeader("Content-Disposition", "attachment; filename=Consolidated Report.xls");
                    Response.Charset = "";
                    this.EnableViewState = false;
                    System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
                    System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
                    dg.RenderControl(oHtmlTextWriter);
                    Response.Write(oStringWriter.ToString());
                    Response.End();

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Here is the VB.net equivalent

Dim dg As New DataGrid()
dg.HeaderStyle.HorizontalAlign = HorizontalAlign.Center
dg.HeaderStyle.Font.Bold = True
 
dg.DataSource = ds.Tables(0)
dg.DataBind()
 
Response.Clear()
Response.Buffer = True
Response.ContentType = "application/vnd.ms-excel"
Response.AddHeader("Content-Disposition", "attachment; filename=Consolidated Report.xls")
Response.Charset = ""
Me.EnableViewState = False
Dim oStringWriter As New System.IO.StringWriter()
Dim oHtmlTextWriter As New System.Web.UI.HtmlTextWriter(oStringWriter)
dg.RenderControl(oHtmlTextWriter)
Response.Write(oStringWriter.ToString())
Response.End()

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are you using VB2008? In this case, see how easy it is to generate a CSV or XML document from a dataset: http://www.emoreau.com/Entries/Articles/2009/04/Using-LINQ-and-XML-Literals-to-transform-a-DataTable-into-a-HTML-table.aspx