[Solved] How to create a text file name with textbox value?

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Thank U guys ,with all Your help I solved it

 private void button2_Click(object sender, EventArgs e)
    {
        button2.Text = "SAVE";      
        var files = Directory.GetFiles(@"C:\\Users\\Apple\\Desktop\\proj").Length;
        string fileName = textBox1.Text.Substring(0, 3) + -+ ++files + ".txt";
        string path2 = Path.GetFullPath("C:\\Users\\Apple\\Desktop\\proj");
        string docPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
        string var = Path.Combine(docPath, path2);
        string var1 = Path.Combine(var, fileName);
        using (StreamWriter writer = new StreamWriter(var1))
        {
            string var6 = textBox1.Text;
            string var7 = "                 ";
            string var8 = textBox2.Text;

            string var9 = string.Concat(var6, var7, var8);
            writer.WriteLine(var9);

        }

        MessageBox.Show("File created");

}

solved How to create a text file name with textbox value?