Hi,
I have ALL my catch blocks writing to a log file that gets sent to me once a day.
I see the error:
Title: Error
Message: Conversion from type 'DBNull' to type 'String' is not valid.
StackTrace: at Microsoft.VisualBasic.CompilerServices.Conversions.ToString(Object Value)
at TenantTracker2013.TenantList.TenantsDataGridView_CellFormatting(Object sender, DataGridViewCellFormattingEventArgs e)
Date/Time: 1/12/2014 8:03:17 AM
I'm not quite sure how to get rid of it.
Its a simple form with a datagridview on it, with several columns, one being the birthday, I also have an Age column that I use CellFormatting to calculate the age.
I believe the error occurs when the birthday field is empty, I thought the following code would prevent the error, but it does not. So the cell formatting is for any column? That being the case, I have 2 other date fields in the datagridview that could also be empty/null, maybe its not my birthday field causing the problem.
Thanks
LB
I have ALL my catch blocks writing to a log file that gets sent to me once a day.
I see the error:
Title: Error
Message: Conversion from type 'DBNull' to type 'String' is not valid.
StackTrace: at Microsoft.VisualBasic.CompilerServices.Conversions.ToString(Object Value)
at TenantTracker2013.TenantList.TenantsDataGridView_CellFormatting(Object sender, DataGridViewCellFormattingEventArgs e)
Date/Time: 1/12/2014 8:03:17 AM
I'm not quite sure how to get rid of it.
Its a simple form with a datagridview on it, with several columns, one being the birthday, I also have an Age column that I use CellFormatting to calculate the age.
I believe the error occurs when the birthday field is empty, I thought the following code would prevent the error, but it does not. So the cell formatting is for any column? That being the case, I have 2 other date fields in the datagridview that could also be empty/null, maybe its not my birthday field causing the problem.
Code:
Private Sub TenantsDataGridView_CellFormatting(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellFormattingEventArgs) Handles TenantsDataGridView.CellFormatting
Try
If e.RowIndex <> -1 AndAlso e.ColumnIndex = Birthday1.Index Then
If String.IsNullOrEmpty(e.Value) = False Then
Dim dob As Date = e.Value
TenantsDataGridView.Rows(e.RowIndex).Cells("Age1").Value = CStr(Math.Floor(Now.Year - dob.Year))
End If
End If
Catch ex As Exception
Dim el As New ErrorLogger
el.WriteToErrorLog(ex.Message, ex.StackTrace, "Error")
End Try
End SubLB