CODEWITHSUNDEEP
c#sqlsql-serverasp-classic
user1781830
user1781830

Reputation: 719

how to add mutiple rows of values queried from sql into cmd

I have the following piece of code. The SQL query returns me two rows of value. However, when I involve the method cmd.ExecuteReader(); the application only returns the first row of values.

How do I go about resolving this? Is it something wrong with the cmd.Parameters.AddWithValue method? Please help! 

sqlQuery = "select name, data,data2 from surgicalfiledemo where id = '2'";
SqlCommand cmd = new SqlCommand(sqlQuery, con);
cmd.Parameters.AddWithValue("id", surgicalGridView.SelectedRow.Cells[1].Text);

SqlDataReader dr = cmd.ExecuteReader();

if (dr.Read())
{
   HttpContext.Current.Response.ClearContent();
   HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=" + dr["name"].ToString() + ".xls");
   HttpContext.Current.Response.ContentType = "application/excel";
   Response.Charset = "";
   Response.Cache.SetCacheability(HttpCacheability.NoCache);
   Response.Write(dr["data"] + "\t");
   Response.Write(dr["data2"] + "\t");
   Response.End();
}

Upvotes: 0

Views: 246

Answers (1)

BizApps
BizApps

Reputation: 6130

If you are using command parameters you must use @ parameter on your query: Change Id='2' to Id=@Id then and on your add with value "id" change it to @Id.

Try this:

sqlQuery = "select name, data,data2 from surgicalfiledemo where id = @id";
SqlCommand cmd = new SqlCommand(sqlQuery, con);
cmd.Parameters.AddWithValue("@id", surgicalGridView.SelectedRow.Cells[1].Text);

//SqlDataReader dr = cmd.ExecuteReader(); use sqldata adapter to load all the data then fill to to Datatable and Bind it on GridView
SqlDataAdapter adapt = new SqlDataAdapter();
DataTable dt = new DataTable();
adapt.SelectCommand = cmd;
adapt.Fill(dt);
GridView GridView1 = new  GridView();
GridView1.DataSource = dt;
GridView1.DataBind();

// if (dr.Read()) {  .. }  this causes you to return single record only, your export to excel execute every time a row was read thats why you can only see one record.

Response.Clear();
Response.Buffer = true;
string filename="MyExportedData.xls"; 
Response.AddHeader("content-disposition","attachment;filename="+filename);
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.RenderControl(hw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();

Check this link : ASP.NET: Export Grid View to Excel

Best Regards

Upvotes: 1

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