Experts invited, thank you very much for text search. .

wenmy715

private int position = 0;

private void Button1_Click (object sender, System.EventArgs e)
{
if ((position = text2.Text.IndexOf (text1.Text.Trim (), position)) <0)
{
position = 0;
MessageBox.Show ("Search has reached the end of the document");
}
else
{
text2.Select (position, text1.Text.Trim (). Length);
position + = text1.Text.Trim (). Length;
}
}