Questions about cross-process access in. NET (C #) _ Practical Tips

Namespace Process_image
{
public partial class Jszg_upload:form
{
static bool Stop_flag = FALSE;
Public Jszg_upload ()
{
InitializeComponent ();
}
private void Upload_button1_click (object sender, EventArgs e)
{
Stop_flag = false;
if (this.checkBox1.Checked)
{
String connectionString = "Connection string";
using (SqlConnection conn = new SqlConnection (connectionString))
{
Conn. Open ();
SqlCommand cmd = new SqlCommand ("Update my_jszg set filemime=null, filebody = null", conn);
Cmd. ExecuteNonQuery ();
Conn. Close ();
}
}
New Thread (UPLOADIMAGETODB). Start ();
}//end Upload_button1_click
void Uploadimagetodb ()
{
The first step: Find the file and number of folders below
DirectoryInfo myFolder = new DirectoryInfo ("BCD");
fileinfo[] myfiles = Myfolder.getfiles ();
This.richTextBox1.Text = "Found from folder:" + myFiles.Length.ToString () + "File!" "+" \ n ";
This.jindutiao_progressBar1.Maximum = Myfiles.length;
Step two: Start uploading files
String connectionString = "Connection string";
using (SqlConnection conn = new SqlConnection (connectionString))
{
Conn. Open ();
for (int i = 0; i < myfiles.length; i++)
{
if (Stop_flag)
Break
Progress bar
This.jindutiao_progressBar1.Value = i + 1;
This.pictureBox1.ImageLocation = Myfiles[i]. FullName;
This.richTextBox1.Text = Myfiles[i]. Name + "\ n" + this.richTextBox1.Text;
This.baifenbi_label1. Text = (((i + 1) * 1.0)/myfiles.length) * 100) + "%";
Uploading the actual data image/jpeg
SqlCommand cmd = new SqlCommand ("Update my_jszg set filemime= ' Image/jpeg ', filebody = @myfilebody from MY_JSZG where certificate number = @myzjhm ", conn);
byte[] fb = new Byte[myfiles[i]. Length];
BinaryReader br = new BinaryReader (myfiles[i). OpenRead ());
Br. Read (FB, 0, (int) myfiles[i]. Length);
Cmd. Parameters.addwithvalue ("@myfilebody", FB);
Cmd. Parameters.addwithvalue ("@myzjhm", Myfiles[i]. Name.substring (0, Myfiles[i]. Name.lastindexof ('. '));
Cmd. ExecuteNonQuery ();
Br. Close ();
}//end for
Conn. Close ();
}
MessageBox.Show ("All files uploaded!") ");
}
Stop uploading
private void Stop_button_click (object sender, EventArgs e)
{
Stop_flag=true;
}
}
}
In this code, access to a control is like: This.richTextBox1.Text = Myfiles[i]. Name + "\ n" + this.richTextBox1.Text; In only one thread, if access to the control in two processes will be an error! If you cannot access it in your program's own thread and Uploadimagetodb thread.