C#

SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=northwind;Integrated Security=True");            
SqlCommand cmdSelect = new SqlCommand("select * from customers", con);            
SqlDataReader dr;            
DataTable dt = new DataTable();            
DataSet ds = new DataSet();            
con.Open();            
dr = cmdSelect.ExecuteReader();            
dt.Load(dr);            
con.Close();            
Microsoft.Reporting.WinForms.ReportDataSource rds = new Microsoft.Reporting.WinForms.ReportDataSource("Customers",dt);            
this.reportViewer2.LocalReport.DataSources.Add(rds);            this.reportViewer2.LocalReport.ReportEmbeddedResource= "ReportingServices.Report1.rdlc";           
this.reportViewer2.RefreshReport();

Reza Shojaee wrote:

My Problem not TextBox.
You suppose I want show data from file line by line into TextBox.
My problem is volume of file

StreamReader sr = new StreamReader("c:\\1.psd");<br />
            string line;<br />
<br />
            while ((line = sr.ReadLine()) != null)

List<string> list = new List<string>();
using (StreamReader sr = new StreamReader(openFileDialog1.FileName))
{
      //Read lines
      while (sr.Peek() >= 0)
         list.Add(sr.ReadLine());
}