Exception in OpenFileDialog

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hello members,
i m getting an exception while working with OpenFileDialog,following is the code

C#

private void btnBrowse_Click(object sender, EventArgs e)
       {
           OpenFileDialog f = new OpenFileDialog();
           if(f.ShowDialog()==DialogResult.OK)
           {
               txtDoc.Text = f.FileName;
           }
       }

and the exception message is:

Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process.

plz help me...why m i getting this msg...i have included all the necessary namespaces...

Posted 5-Mar-12 1:40am

Dinesh92

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El_Codero · Accepted Answer · 2012-03-05T01:49:00

Solution 1

Hi,

it's needed to run OLE calls (like the OpenFileDialog) in a Single Thread (STA), your thread is running in Multithread (MTA).

Just add [STAThread] to your main() method.

Regards

Posted 5-Mar-12 1:49am

El_Codero

Comments

[no name] 5-Mar-12 7:51am

how..???

[no name] 5-Mar-12 7:54am

this is my main program:

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace College_managemet_System
{
static class Program
{
///

/// The main entry point for the application.
///

//[STAThread]
public static SqlConnection con;
public static void Connection2Server()
{
con = new SqlConnection();
con.ConnectionString = "Data Source=DINESH; Initial Catalog=College_Management_System; User ID=sa; Password=niitvasai";
con.Open();
}
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}

tell me where the problem is....

El_Codero 5-Mar-12 8:01am

The STAThrea Attribute hast to be set explicit to the entry point or method.

static class Program
{
///

/// The main entry point for the application.
///

public static SqlConnection con;
public static void Connection2Server()
{
con = new SqlConnection();
con.ConnectionString = "Data Source=DINESH; Initial Catalog=College_Management_System; User ID=sa; Password=niitvasai";
con.Open();
}

[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}

El_Codero 5-Mar-12 7:57am

in your program.cs:

[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}

[no name] 5-Mar-12 8:13am

you mean to say,just above the main method starts...???

[no name] 5-Mar-12 8:15am

yes...yes...i got it....thanx buddy very much....i got the solution....

El_Codero 5-Mar-12 10:44am

haha it's great if someone is so glad about a solution. Have fun with Programming;) Best Regards