string strErrorMes = null;

if(Validates()){  XXXXX} public bool Validates()        {            if (this.txtUserName.Text == "")            {                strErrorMes = "姓名不能为空！";                this.txtUserName.Focus();                errorProvider.SetError(this.txtUserName, strErrorMes); //给errorProvider控件赋值            }            if (this.txtNativePlace.Text == "")            {                strErrorMes = "籍贯不能为空！";                this.txtNativePlace.Focus();                errorProvider.SetError(this.txtNativePlace, strErrorMes); //给errorProvider控件赋值            }            if (this.txtphone.Text == "")            {                strErrorMes = "电话不能为空！";                this.txtphone.Focus();                errorProvider.SetError(this.txtphone, strErrorMes); //给errorProvider控件赋值            }            else            {                string regStr = @"((\d{11})|^((\d{7,8})|(\d{4}|\d{3})-(\d{7,8})|(\d{4}|\d{3})-(\d{7,8})-(\d{4}|\d{3}|\d{2}|\d{1})|(\d{7,8})-(\d{4}|\d{3}|\d{2}|\d{1}))$)";                bool isRightNo = Regex.IsMatch(txtphone.Text.Trim(), regStr);                if (!isRightNo)                {                    strErrorMes = "电话格式错误";                    txtphone.Focus();                    errorProvider.SetError(txtphone, strErrorMes);                }            }            if (strErrorMes != null)            {

              strErrorMes = null;

              return false;

            }            return true;        }