Access Form1 Control from Form2 Control

Question

I am Doing Notpad at the moment.

I placed a richTextBox in Form1 and textbox and a button in Form2.

When I press Find in form1, It goes to the Form2.

I need help from you from here.

when I enter a string in textBoxand press button1 in form2 , I want the function of searching string in richTextBox in Form1.

if it found a string , highlights the line.

please help me.

Vulpes · Answer

Try this: /* in Form1 */ private void btnFind_Click(object sender EventArgs e) { richTextBox1.Text = richTextBox1.Text.Trim(); if (richTextBox1.Text.Length > 0) { richTextBox1.SelectAll(); richTextBox1.SelectionBackColor = richTextBox1.BackColor; new Form2(richTextBox1).Show(); } else { MessageBox.Show(Text box is empty!); richTextBox1.Focus(); } } /* Form2 */ public partial class Form2 : Form { private RichTextBox rtb; //add this private field public Form2(RichTextBox rtb) // change constructor to accept a parameter { InitializeComponent(); this.rtb = rtb; } private void button1_Click(object sender EventArgs e) { textBox1.Text = textBox1.Text.Trim(); if (textBox1.Text.Length > 0) { int index = rtb.Find(textBox1.Text); if (index == -1) { MessageBox.Show(Text not found); } else { rtb.SelectionBackColor = Color.Yellow; } this.Close(); } else { MessageBox.Show(Please enter a string to search for); textBox1.Focus(); } } // any other code }