ผม Insert ข้อมูลที่เป็น Directory Path ผมกำหนด Data type เป็น NVarchar (256) แล้วมัน error ดังนี้ :

   sb.Remove(0, sb.Length())
                    sb.Append("INSERT INTO Doctor (DoctorID,InitialID,DoctorName,Age,Sex,")
                    sb.Append(" IDCard,Address,ProvinceID,Telephone,DID,BirthDate,")
                    sb.Append(" Salary,ImagePath,IsLeave,LastAccessBy)")

                    sb.Append(" VALUES (@DoctorID,@InitialID,@DoctorName,@Age,@Sex,")
                    sb.Append(" @IDCard,@Address,@ProvinceID,@Telephone,@DID,@BirthDate,")
                    sb.Append(" @Salary,@ImagePath,@IsLeave,@LastAccessBy)")
                    sqlOK = sb.ToString()

                    .CommandText = sqlOK
                    .Parameters.Clear()
                    .Parameters.Add("@DoctorID", SqlDbType.NVarChar).Value = lblDoctorID.Text.Trim()
                    .Parameters.Add("@InitialID", SqlDbType.NVarChar).Value = CStr(cboInitial.SelectedValue)
                    .Parameters.Add("@DoctorName", SqlDbType.NVarChar).Value = txtDoctorName.Text.Trim()
                    .Parameters.Add("@Age", SqlDbType.Int).Value = txtAge.Text.Trim()
                    If optMale.Checked = True Then
                        .Parameters.Add("@Sex", SqlDbType.NVarChar).Value = "Male"
                    Else
                        .Parameters.Add("@Sex", SqlDbType.NVarChar).Value = "Female"
                    End If
                    .Parameters.Add("@IDCard", SqlDbType.NVarChar).Value = mskIDCard.Text.Trim()
                    .Parameters.Add("@Address", SqlDbType.NVarChar).Value = txtAddress.Text.Trim()
                    .Parameters.Add("@ProvinceID", SqlDbType.NVarChar).Value = CStr(cboProvince.SelectedValue)
                    .Parameters.Add("@Telephone", SqlDbType.NVarChar).Value = txtTelephone.Text.Trim()
                    .Parameters.Add("@BirthDate", SqlDbType.DateTime).Value = dtpBirthDate.Value
                    .Parameters.Add("@Salary", SqlDbType.Int).Value = txtSalary.Text.Trim()
                    .Parameters.Add("@DID", SqlDbType.NVarChar).Value = CStr(cboDepartment.SelectedValue)
[font=Verdana]                    .Parameters.Add("@ImagePath", SqlDbType.NVarChar).Value = Path.GetFileName(txtImagePath.Text)[/font]
                    .Parameters.Add("@IsLeave", SqlDbType.NVarChar).Value = "0"
                    .Parameters.Add("@LastAccessBy", SqlDbType.NVarChar).Value = UserName
                    .ExecuteNonQuery()
                End With