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copied!<p>Just pass the form 2 reference to form three while instantiating it.. similarly as you did for form1 while opening form2. then from form3 use the form2 reference to call updatetext method which should be a public method on form2</p> <p>here is code for all 3 forms, you can update any form from others, i have made it so that you can access form1 and form2 in form3.</p> <pre><code>using System; using System.Linq; using System.Text; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form2 frm2; public Form3 frm3; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { } public void updateText() { this.textBox1.Text = ""; } private void button1_Click(object sender, EventArgs e) { if (frm2 == null) frm2 = new Form2(this); frm2.ShowDialog(); } } } using System; using System.Text; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form2 : Form { public Form1 refToForm1; public Form2(Form1 f1) { refToForm1 = f1; InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { if (refToForm1.frm3 == null) refToForm1.frm3 = new Form3(this); refToForm1.frm3.ShowDialog(); } public void UpdateForm2(string txt) { this.textBox1.Text = txt; } } } using System; using System.Linq; using System.Text; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form3 : Form { Form2 refToForm2; public Form3( Form2 f2) { refToForm2 = f2; InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { //Pass any data to Form1; refToForm2.refToForm1.updateText(); //Pass data to form2 refToForm2.UpdateForm2("from form3"); } } } </code></pre>

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