I am writing a vb.net app using vs. 2003(.net1.1) I have a data table that I am populating based on a query. After the Data table has been filled I have another loop that iterates through each column of the data table and compares the name to a select case statement where it will then check the value. If it matches I need to be able to run updates on the data table to only a single item. Can someone help me with the code to run an update on the data table?
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There isn't any type of blanket UPDATE statement for a datatable. Your only option is to either loop through each row in your datatable and then update the specific field you're interested in...
'loop through each row
For Each row As DataRow In MyDataTable.Rows()
If Convert.ToString(row("MyFi
row("MyField1") = "MyNewValue"
End If
Next
Or else add a primary key to the datatable (if you don't yet have one) using the PrimaryKeys property (http://msdn2.microsoft.co
'set an existing column as the primary key
Dim keys(1) As DataColumn
keys(0) = MyDataTable.Columns("MyPri
MyDataTable.PrimaryKeys = keys
'find a row by primary key
Dim row As DataRow = MyDataTable.Rows.Find("MyP
If Not row Is Nothing Then
row("MyField1") = "MyNewValue"
End If
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by: jfsedlar3rdPosted on 2007-07-24 at 12:16:12ID: 19559080
This is what i have so far:
Dim ColumnName As String
For i = 0 To dt.Rows.Count
For Each col In dt.Columns
ColumnName = col.ColumnName.ToString
Select Case ColumnName
Case "Middle Initial"
'Perform Update here
End Select
Next col
Next