Datagrid view VB.NET

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How we can calculate the value of Datagridview cell like if cell value is 6+2+9 and result is shown in second column
Coulumn A Cloumn B
6+6+2 ???

What I have tried:

i tried this code but second cell not show result of first cell
Dim DocNo As String
If e.RowIndex >= 0 Then
Try
DocNo = Math.Abs(CDbl(DataGridView3.Rows(e.RowIndex).Cells(0).Value.ToString))
DataGridView3.Rows(e.RowIndex).Cells(1).Value = DocNo
Catch
DataGridView3.Rows(e.RowIndex).Cells(0).Value = "?"
End Try

Posted 13-Mar-22 21:19pm

Talha Muneer

Updated 13-Mar-22 21:38pm

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OriginalGriff · Accepted Answer · 2022-03-13T21:38:00

Your cell already contains a string: "6+6+2", so calling ToString on it doesn't do anything useful.

And strings that contain equations can't be "converted" to numbers by calling CDbl - all that will do is throw an exception - which you catch - because the whole string is not a number:

VB

Dim s As String = "6+6+2"
Dim DocNo As String
DocNo = Math.Abs(CDbl(s))
Console.WriteLine(DocNo)

Will throw an exception:

System.InvalidCastException: Conversion from string "6+6+2" to type 'Double' is not valid. ---> System.FormatException: Input string was not in a correct format.

What you need to do is evaluate the string expression as a number - this may help: An expression evaluator written in VB.NET[^]
Or you could use the DataTable.Compute[^] method:

Dim result = New DataTable().Compute("6+6+2", Nothing)

But that's not particularly efficient as you have to create a whole DataTable object to do it ...