عجله ای نوشتم ولی میشد بهتر از اینم نوشت
int Index=0;
int End= 0;
private void button3_Click(object sender, EventArgs e)
{
richTextBox1.SelectionStart = Index;
richTextBox1.SelectionLength = End;
richTextBox1.SelectionBackColor = Color.White;
SelectNextText(End);
}
public void SelectNextText(int index)
{
int A=index;
int B=index;
for(int i=A+1;i<=richTextBox1.TextLength;i++)
{
richTextBox1.SelectionStart=i;
richTextBox1.SelectionLength=1;
if(richTextBox1.SelectedText==" ")
{
richTextBox1.SelectionStart = index;
richTextBox1.SelectionLength = i-A;
richTextBox1.SelectionBackColor = Color.Orange;
this.End = i+1;
break;
}
}
}