SAPIWS_Sample.frmMain.btnSign_Click C# (CSharp) Method

        private void btnSign_Click(object sender, EventArgs e)
        {
            SAPIWSWrapper SapiWS = new SAPIWSWrapper();

            if (this.txtPDFFile.Text.Trim().Length < 3)
            {
                MessageBox.Show("Please select PDF file to Sign", "Error");
                this.txtPDFFile.Focus();
                return;
            }

            if (this.txtUsername.Text.Trim().Length < 1)
            {
                MessageBox.Show("Please Define UserName", "Error");
                this.txtUsername.Focus();
                return;
            }

            if (this.txtPassword.Text.Trim().Length < 1)
            {
                MessageBox.Show("Please define CoSign password", "Error");
                this.txtPassword.Focus();
                return;
            }

            bool res = SapiWS.SignPDFFile(txtPDFFile.Text, txtUsername.Text, txtPassword.Text, (int)nudX.Value, (int)nudY.Value,
                (int)nudWidth.Value, (int)nudHeight.Value, (int)nudPage.Value, true);

            if (!res)
                MessageBox.Show("Signing Failed", "SAPI WS Demo");
            else
                MessageBox.Show("Signature was applied successfully", "SAPI WS Demo");
        }