Addition in Datagridview

Question

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I want to add column wise data present in Datagridview. I am getting the sum if all values present in cells.

If in a cell value is not there(NULL) it is showing ERROR:

operator + is not defined for type Integer and type DBNull.

Code snippet:

VB

For j As Integer = 0 To DataGridView1.Columns.Count - 1
    For i As Integer = 0 To DataGridView1.Rows.Count - 1
        total = total + DataGridView1(j, i).Value
    Next

    TableLayoutPanel1.Controls(j).Text = total
    total = 0
Next

Posted 20-May-11 0:20am

Member 7940184

Updated 20-May-11 0:27am

Slacker007

v2

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3 solutions

Solution 2

The reason for this is that null values from the database are represented with DbNull[^] values in memory. You need to add a conditional around the place where you add DataGridView1(j, i).Value to the total, deciding what to do when you see a null value (for example, skip it). There is an example at the above link showing you how to do it.

Posted 20-May-11 0:40am

dasblinkenlight

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CS2011 · Accepted Answer · 2011-05-20T00:37:00

+ operator does not work with null so put a simple check before adding the data as follow

VB

For j As Integer = 0 To DataGridView1.Columns.Count - 1
    For i As Integer = 0 To DataGridView1.Rows.Count - 1
        if IsDBNull(DataGridView1(j, i).Value) <> True then
             total = total + DataGridView1(j, i).Value
        end if
    Next

    TableLayoutPanel1.Controls(j).Text = total
    total = 0
Next

Karwa_Vivek · Accepted Answer · 2011-05-20T01:02:00

Solution 3

try This

total = total + If(IsDBNull(Me.DataGridView1.Item(j, i).Value), 0, Me.DataGridView1.Item(j, i).Value)

Posted 20-May-11 1:02am

Karwa_Vivek