How to set the property to true that will allow me to insert null values? [duplicate]
You appear to be using a strongly-typed DataSet. In this case, the generated code will contain methods to set fields to null. For example, if your field QuarterDisplay allows DBNull, the generated code in AvailabilityDS.Designer.cs will include a method SetQuarterDisplayNull(). It will also include a method IsQuarterDisplayNull() that you can...
How to handle null field when inserting in access
it should leave it null if you don't set it to anything else. Have you tried If Cost > "" Then dsNewRow.Item(8) = Cost End If ? Is the field nullable? You could also try setting it to zero if it can't be null: If Cost > "" Then dsNewRow.Item(8)...
Argument 'Expression' cannot be converted to type 'DBNull' in vb.net
Try this ... If IsDBNull(Me.DataGridView1.Rows(e.RowIndex).Cells(e.ColumnIndex).Value()) Then Me.DataGridView1.Rows(e.RowIndex).Cells(e.ColumnIndex).Value = 0 Else If Val(Me.DataGridView1.Rows(e.RowIndex).Cells(e.ColumnIndex).Value) < 0 Then Me.DataGridView1.Rows(e.RowIndex).Cells(e.ColumnIndex).Value = 0 End If End If ...
Data is Null in my case in my List.Add
c#,asp.net-mvc,angularjs,dbnull
Better use IsDBNull .. just like this one : RequestID = key, PartDesc = reader.IsDBNull(17) ? null : reader.GetString(17), PartNumber = reader.IsDBNull(23) ? null : reader.GetString(23), SupplierID = reader.IsDBNull(18) ? null : reader.GetString(18), FullName = reader.IsDBNull(7) ? null : reader.GetString(7), AccountType = reader.IsDBNull(19) ? null : reader.GetString(19), CurrName = reader.IsDBNull(20)...
Handle DBNull in an object initializer
asp.net,vb.net,initialization,asmx,dbnull
You can use Convert.ToString <WebMethod> _ Public Function GetCustomerDetail(ByVal sqlQuery As String) As List(Of customerInfo) Dim detaillist = New List(Of customerInfo)() Dim detail As customerInfo Dim da = New SqlDataAdapter(sqlQuery, conn) Dim dt = New DataTable() da.Fill(dt) For Each dr As DataRow In dt.Rows Dim registerDate As Date If Date.TryParse(Convert.ToString(dr("REGISTER_DATE")),...
Will nullable value consider both null (“”) and DBNull at the same time
c#,asp.net,double,nullable,dbnull
Your method could simply be written as public double Difference(object val1, object val2) { double value1; double value2; double.TryParse(val1.ToString(), out value1); double.TryParse(val2.ToString(), out value2); return value1 - value2; } Assuming val1 and val2 are never null(same is true for your code too). Also I made the return type as double....
Trickly null validation for SQL Query
It looks like lstTypeSearch here represents a column name (hence parameterization: not an option), so the first thing I'd say is: make sure you white-list that. Rather than trying to do everything in one go, separate the two cases: if(string.IsNullOrEmpty(lstTypeSearch.SelectedItem)) { // nothing to check? } else { CheckValidColumn(lstTypeSearch.SelectedItem); //...