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copied!<p><strong>Solution 1:</strong> you can pass your <code>int</code> variable to New Form <code>Constructor</code> and assign that value in the <code>NewForm</code> constructor.</p> <p>Try This: </p> <p><strong>Program.cs</strong> </p> <pre><code> static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1(0)); } </code></pre> <p><strong>Form1 Code:</strong> </p> <pre><code> int no = 10; public Form1(int no) { this.no=no; InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Form2 form2 = new Form2(no); this.Hide(); form2.ShowDialog(); } </code></pre> <p><strong>Form 2: Code</strong> </p> <pre><code> int no; public Form2(int no) { this.no = no; InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { no = 20; Form1 form1 = new Form1(no); this.Hide(); form1.Show(); } </code></pre> <p><strong>Solution 2:</strong> you can take <code>public</code> <code>static</code> varible in <code>Form1</code> and access that variable in chid forms using their class names.</p> <p>Try This:</p> <p><strong>Form1 Code:</strong> </p> <pre><code> public static int no = 10; public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Form2 form2 = new Form2(); this.Hide(); form2.ShowDialog(); } </code></pre> <p><strong>Form 2: Code</strong> </p> <pre><code> public Form2() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Form1.no = 20; //access Form1 int variable Form1 form1 = new Form1(no); this.Hide(); form1.Show(); } </code></pre>

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