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        private void button2_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.ShowDialog();
            ofd.Filter = "Excel Îļþ(*.xls)|";
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            ofd.CheckPathExists = true;
            ofd.CheckFileExists = true;
            string filepath = ofd.FileName;
            this.textBox1.Text = filepath;
        }
        public void ExecMothod()
        {
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