How to use checkbox to select my data - sql

Question

i am using vb.net with microsoft sql
i want to retrieve data where the checkbox is selected how could i perform it?
this the code i currently have
Dim chk As New DataGridViewCheckBoxColumn()
DataGridView1.Columns.Add(chk)
chk.HeaderText = "Select"
chk.Name = "lol"
sql.RunQuery("Select ID,JobPosition,requiredQualification,Salary, description,JobExpYear from vacancy where JobPosition IN (Select JobPosition from employer where EID = '" & ID & "')")
If sql.SQLDS.Tables.Count > 0 Then
DataGridView1.DataSource = sql.SQLDS.Tables(0)
End If
i will have checkbox within my data grid, how do i call it?

Answer 1

I'm not sure if this is what you need, question not clear enough for me. But see if this helps:
Dim condition As String = String.Empty
For Each row As DataGridViewRow In DataGridView1.Rows
condition += DirectCast(row.Cells(0), DataGridViewCheckBoxCell).Selected.ToString + ", "
Next
If Not String.IsNullOrEmpty(condition) Then
'Remove last splitter
condition = condition.Substring(0, condition.Length - 2)
End If

Answer 2

Your question: "i am using vb.net with microsoft sql i want to retrieve data where the checkbox is selected how could i perform it?"
There are a few different ways that this can be accomplished. You can either one, create a function that returns if it's checked or not or create a method that does all of your logic for you, it depends on how your going to use it. According to your query your not getting any information from the DataGridView, you are saying you want to retrieve data if it's checked or not. Another question is what is the purpose of running the same query if you have multiple rows, are you going to be running different queries based on the CheckBox for that row if it's checked?
Example 1 -Create a function to see what the value is
''' <summary>
''' Returns if given column is checked or not
''' </summary>
''' <param name="dGrid"></param>
''' <param name="dRow"></param>
''' <param name="intIndex"></param>
''' <returns></returns>
''' <remarks></remarks>
Public Shared Function IsColumnChecked(ByVal dGrid As DataGridView, ByVal dRow As DataGridViewRow, ByVal intIndex As Integer) As Boolean
Dim blnIsChecked As Boolean = False
Try
'What column is the checkboxcolumn and let's make sure its the correct type
If TypeOf (dGrid.Columns(intIndex)) Is DataGridViewCheckBoxColumn Then
If dGrid.RowCount <> 0 Then
If CBool(DirectCast(dRow.Cells(intIndex), DataGridViewCheckBoxCell).Value) Then
blnIsChecked = True
End If
Else
Return blnIsChecked
End If
Else
Return blnIsChecked
End If
Catch ex As Exception
Return blnIsChecked
End Try
Return blnIsChecked
End Function
Example 1 Useage - Check to see if given row is checked or not-
'Example ONLY on a button click...
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
If IsColumnChecked(DataGridView1, DataGridView1.CurrentRow, 0) Then
MessageBox.Show("It's Checked!")
Else
MessageBox.Show("Not Checked!")
End If
End Sub
You can also put this in a method to do what you want with other logic, not sure how you are going to use it. This function is good to determine if you want to continue with other things or not and can be used in other areas of your program as well.
Good Luck!