Access TextBox from a thread- winforms

Posted Date: 29 Jun 2012 Posted By:: Nagamohan kumar P Member Level: Gold Member Rank: 1147 Points: 5 Responses: 1

1. I am using a simple windows application in which there is a button click event.
2. There is a method to update a text box on the form which is called o=in the btn click event.
3. normal is working fine but if i use a thread and pass the method it is firing an error like this
error: Cross-thread operation not valid: Control 'textBox1' accessed from a thread other than the thread it was created on.
code:
private void button1_Click(object sender, EventArgs e)
{
System.Threading.Thread trd = new System.Threading.Thread(doSomeOperation);
trd.Start();
MessageBox.Show("done");
}

private void doSomeOperation()
{
textBox1.Text = "";
textBox1.Refresh();
string str = @"Most of the Yandamoori Veerendranath's novels were made into commercial movies in Chiru-A.Kodanda Ramireddy-Creative Commercials banner by K.S.Rama Rao and Maestro Ilayaraja music. ";

for (int i = 0; i < 200; i++)
{
System.IO.StreamWriter file = new System.IO.StreamWriter("e:\\test.txt");
file.WriteLine(str);
file.Close();
}
}

Responses

#678167 Author: sudhajosyula Member Level: Gold Member Rank: 46 Date: 29/Jun/2012 Rating: Points: 3
Hi Kumar, This is a common error usually comes.See the below url for a detailed explanation given as how to avoid this type of errors.. `http://alitarhini.wordpress.com/2011/04/06/cross-thread- operation-not-valid-control-controlname-accessed- from-a-thread-other-than-the-thread-it-was-created-on/`

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