C#

<br />
object locker = new object();<br />
 private void opg_filter_functie()<br />
{<br />
lock(locker) {<br />
//check if textbox isnt empty<br />
if (opg_filterbox.Text.Length > 0)<br />
{<br />
try<br />
{<br />
opg_tv_filter.Nodes.Clear();<br />
//sql injection causes error fix<br />
opg_filterbox.Text = opg_filterbox.Text.Replace("'", "");<br />
//create query<br />
<br />
SqlDataAdapter dAdapter = new SqlDataAdapter("SELECT artiestNaam FROM artiest where artiestnaam like '" + opg_filterbox.Text + "%'" ,sqlcon);<br />
DataSet dataset_filter = new DataSet();<br />
<br />
<br />
dAdapter.Fill(dataset_filter); //crash here if typing to fast <br />
}

public class frmAddCategory:Form
{
   //your stuff for the form here
   public string NewPost
   {
        get
        {
            return txtNewPost.Text; // i guess you want to add the entered Value into the callers ComboBox..
        }
   }
}
public class frmCore:Form
{
    // your code here..
    private void SomeButton_Click(object sender, EventArgs e)
    {
        frmAddCategory blah = new frmAddCategory();
        if (blah.ShowDialog() == DialogResult.OK)
        {
            myComboBox.Items.Add(blah.NewPost);
        }
    }
}

m@u wrote:

public class frmAddCategory:Form
{
//your stuff for the form here
public string NewPost
{
get
{
return txtNewPost.Text; // i guess you want to add the entered Value into the callers ComboBox..
}
}
}
public class frmCore:Form
{
// your code here..
private void SomeButton_Click(object sender, EventArgs e)
{
frmAddCategory blah = new frmAddCategory();
if (blah.ShowDialog() == DialogResult.OK)
{
myComboBox.Items.Add(blah.NewPost);
}
}
}

public class frmAddCategory
{
   public event EventHandler CategoryAdded;
   protected virtual void onCategoryAdded(EventHandler e)
   {
        if (CategoryAdded != null)
        {
            CategoryAdded(this,e);
        }
   }
   private void someEventHandler(...)
   {
       onCategoryAdded(EventArgs.Empty);
   }
   //...
}

Deques wrote:

frmCore core = new frmCore();

Deques wrote:

I am not familiar with delegates

public class Form2 : System.Windows.Forms.Form
{
	public delegate void FormClosed();
	public FormClosed FormClosedHandler;

	private void Form2_Closed(object sender, System.EventArgs e)
	{
		FormClosedHandler();	//Invoking delegate
	}
}

public class Form1 : System.Windows.Forms.Form
{
	private void Form1_Load(object sender, System.EventArgs e)
	{
		Form2 obj = new Form2();
		obj.FormClosedHandler += new Form2.FormClosed(this.Form2ClosedHandler);
		obj.Show();
	}
}