DataTable Expression Column

[Guest]

My DataGrid is bound to a DataSet, with following columns: Description, CashExp, CreditExp,Frequency

On run time, I am adding two new DataColumn “AnnualCash†and “AnnualCredit†and defining Expression property to give product of two columns, as follows

Dim dc As DataColumn
dc = New DataColumn("AnnualCash", GetType(System.Single))
dc.Expression = " CashExp * Frequency"
myDataSet.Tables("ClientExpenses").Columns.Add(dc)

dc = New DataColumn("AnnualCredit", GetType(System.Single))
dc.Expression = " CreditExp * Frequency"
myDataSet.Tables("ClientExpenses").Columns.Add(dc)

The only problem I am getting is when CashExp or CreditExp or Frequency is changed the value of derived column is not changed (calculated) until user changes the row either by tab or arrow keys.

How can I change this behaviour so that the derived columns gets calculated when user edit values in a cell.

I have scoured through stacks of websites, posted to stacks of discussion forum, but no one seems to have a slightest clue about it.

Does that mean I have to ask my user to make sure to change the row, in order to get correct results?

 

[Cor Ligthert]

Hi PankajBanga

Add this on the right place where it is needed to force that what you want.

BindingContext(mydataset.Tables("ClientExpenses")).EndCurrentEdit()

I hope this helps?

Cor

My DataGrid is bound to a DataSet, with following columns: Description, CashExp, CreditExp,Frequency

On run time, I am adding two new DataColumn "AnnualCash" and

"AnnualCredit" and defining Expression property to give product of two
columns, as follows

Dim dc As DataColumn
dc = New DataColumn("AnnualCash", GetType(System.Single))
dc.Expression = " CashExp * Frequency"
myDataSet.TablesColumns.Add(dc)

dc = New DataColumn("AnnualCredit", GetType(System.Single))
dc.Expression = " CreditExp * Frequency"
myDataSet.Tables("ClientExpenses").Columns.Add(dc)

The only problem I am getting is when CashExp or CreditExp or Frequency is

changed the value of derived column is not changed (calculated) until user
changes the row either by tab or arrow keys.

How can I change this behaviour so that the derived columns gets

calculated when user edit values in a cell.

I have scoured through stacks of websites, posted to stacks of discussion

forum, but no one seems to have a slightest clue about it.