public partial class frmCost : Form
public int m_nCost;
private void btnOk_Click(object sender, EventArgs e)
if (txtCost.Text == string.Empty)
errorProvider1.SetError(txtCost, "please enter value");
m_nCost = int.Parse(txtCost.Text);
private void txtCost_KeyPress(object sender, KeyPressEventArgs e)
e.Handled = !Char.IsDigit(e.KeyChar);
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