DBNull data type to string

I created a DataSet fro a query and populate a table with its values. But when a field contains NULL value I receive an error message about conversion DBNull data type to string. Can anyone help me how to solve this problem?
The code as follows:

ByVal strTableName As String)
Dim r As TableRow
Dim c As TableCell
Dim myTable As DataTable
Dim myRow As DataRow
Dim myColumn As DataColumn
Dim strTemp As String

' For each table in the DataSet, print the row values.
myTable = myDataSet.Tables(strTableName)

For Each myRow In myTable.Rows
r = New TableRow()

For Each myColumn In myTable.Columns
c = New TableCell()

strTemp = myRow(myColumn)

c.Controls.Add(New LiteralControl(strTemp))
r.Cells.Add(c)

Next myColumn

Table1.Rows.Add(r)
Next myRow

End Sub

Quote:

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Originally posted by bona
I created a DataSet fro a query and populate a table with its values. But when a field contains NULL value I receive an error message about conversion DBNull data type to string. Can anyone help me how to solve this problem?
The code as follows:
.
.
.
strTemp = myRow(myColumn)
.
.
.

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I only have a C# version, but you should be able to see the direction to go.

Code:

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.
.
.
strTemp = CheckNull(myRow(myColumn))
.
.
.
private String CheckNull(Object objIn)
{
    string strRetVal;
    if (objIn == DBNull.Value) {
        strRetVal = "";
    }
    else {
      strRetVal = objIn.ToString();
    }
    return strRetVal;
}

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Thanks, Patoooey.
It works excellent, the VB code:



...
strTemp = CheckNull(myRow(myColumn))
...

Private Function CheckNull(ByVal objIn As Object) As String
Dim strRetVal As String

If (objIn Is DBNull.Value) Then
strRetVal = ""
Else
strRetVal = objIn.ToString()
End If

Return strRetVal
End Function