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Datagridview  **insert rows

Posted on 2007-12-03
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Last Modified: 2013-11-26
I am trying to populate a datagridview with rows obtained from a file.  
The file has rows broken up by a semi-colon.  The information i need populated in the cells of the datagridview are the values after the semicolon.

What my program does is read the lines of the code.  Then i am trying to remove from the input string all the values to the left of the semi-colon and then inputting that value into the datagridview row.  For some reason VB is telling me to create an instance of a "new" object.  I am not seeing why however.
DataGridView1.Rows.Add()    'ROW ADDED
            varcount = DataGridView1.Rows.Count  'MAX ROWS OF DATAGRIDVIEW
            For xvar As Integer = 0 To 5   'LOOP INPUT FILE
                Dim varstr  
                Dim line  'STRING CONTAINING INPUT
                Dim pos As Integer 'POSITION OF SEMI-COLON
 
                line = sr.ReadLine   'READS LINE
                pos = InStr(line, "; ")  'GETS POSITION OF SEMI-COLON
                varstr = line.Remove(0, pos)  '>>>>>ERROR HERE<<<<<
                DataGridView1.Rows(varcount - 1).Cells(xvar).Value = varstr  'INPUT COLUMN CELLS
            Next xvar

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Question by:alexander001
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aperion earned 750 total points
ID: 20401414
I'd try a couple of different things.  If you have to keep the code the way you have it then try removing the space after the semi-colon in this line:

pos = InStr(line, "; ")  'GETS POSITION OF SEMI-COLON

Declaring your varstr variable as an array allows you to use the split function.   If neither one of these will work for you then I'd try stepping through the code using breakpoints and see what the variables values are and which one if any is throwing the error.

DataGridView1.Rows.Add()    'ROW ADDED
        varcount = DataGridView1.Rows.Count  'MAX ROWS OF DATAGRIDVIEW
        For xvar As Integer = 0 To 5   'LOOP INPUT FILE
            Dim varstr() As String
            Dim line As String = ""  'STRING CONTAINING INPUT
            line = sr.ReadLine   'READS LINE
            varstr = line.Split(";")
            DataGridView1.Rows(varcount - 1).Cells(xvar).Value = varstr  'INPUT COLUMN CELLS
        Next xvar

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by:alexander001
ID: 20403145
Still getting an error.  It's a weird one.  When i run it there's an immediate window that states " A first chance exception of type 'System.NullReferenceException' occured"

Plus when i run through the code i get the error "User the "new" keyword to create an object instance"

These messages come in on my original code at line:
           varstr = line.Remove(0, pos)
and when i use the suggested code for the string array at line:
           varstr = line.Split(";")

Any ideas?
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Expert Comment

by:aperion
ID: 20405958
Set a breakpoint at that line and see which variales are nothing.
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