Database connection in ASP.NET

IF EXISTS(SELECT * FROM SYSOBJECTS WHERE name = 'tablename' AND xtype = 'U')

SqlConnection conn = new SqlConnection();
       conn.ConnectionString = "Ur Connection String";
       conn.Open();
       string strCommand = "SELECT * FROM INFORMATION_SCHEMA.TABLES where table_type!='View' and table_name!='sysdiagrams'";
       SqlCommand cmd = new SqlCommand(strCommand, conn);
       SqlDataAdapter da = new SqlDataAdapter(cmd);
       DataTable dt = new DataTable();
       da.Fill(dt);

       foreach (DataRow dr in dt.Rows)
       {
           if (dr[2] != YourTextBox.Text)
           {
               Response.Write("Table not exist");
           }
       }

       cmd.Dispose();
       conn.Close();