请查看下面指出的更清晰的编辑代码，以便更具体地了解需要帮助的地方。
我想要完成的是：我有一个DataGridView使用 aDataAdapter来填充DataTable. 我已经硬编码了一个单独DataGridViewCheckBoxColumn的来先。列DataGridView如下（按顺序）：
[0]"ADD" (hard-coded `DataGridViewCheckBoxColumn`)
[1]"Job No" (from sql database)
[2]"Project No" (from sql database)
[3]"Project Name" (from sql database)
我还有一个ComboBox填充了来自单独数据库的用户名（但两者有一个共同的键 - userId，将它们与哪个用户关联起来，哪个用户具有管理员权限以以另一种形式编辑该特定项目）。此表单的目的是向该用户添加一个项目，以便他们可以拥有编辑其他项目的管理员权限。
我需要DataGridView填充所有项目，并DataGridViewCheckBoxColumn根据 userId 已经与具有管理员权限的项目（根据数据库中的现有信息）来填充项目的“.checked = true”。然后我需要能够添加新项目，但检查新复选框，然后单击btnUpdate，并相应地更新数据库。
我已经能够填充DataGridView，创建DataGridViewCheckBoxColumn，使该列不是只读的，但我无法检查与项目关联的框，等等...下面是代码...请帮助?
Imports System.Data.SqlClient
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'there is where usernames will be filled into dropdown from Proj_users database
Dim fillUName As New SqlCommand("SELECT UName FROM Proj_User WHERE Active = 1 and Admin = 1", frmConnect.DB)
Dim dr As SqlDataReader = fillUName.ExecuteReader()
While dr.Read()
If dr.HasRows = True Then
cmbAddUName.Items.Add(dr("UName"))
End If
End While
dr.Close()
End Sub
Private Sub cmbAddUName_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmbAddUName.SelectedIndexChanged
Call fillAddGrid(cmbAddUName.Text)
End Sub
Sub fillAddGrid(ByVal PT_User As String)
'column created for checkbox (to be able to check additional projects that will then be added to the user indicated in the combobox's privileges - let's them be able to change that project's details in another form)
Dim chk As New DataGridViewCheckBoxColumn()
grdAddProjectPrivs.Columns.Add(chk)
chk.FalseValue = False
chk.TrueValue = True
chk.HeaderText = "Add"
chk.Name = "Add"
chk.ReadOnly = False
'use stored procedure with parameter to generate recordset
Dim sqlCmd As New SqlCommand
sqlCmd.Connection = frmConnect.DB
sqlCmd.CommandType = CommandType.StoredProcedure
sqlCmd.CommandText = "SP_ManagePrivs"
'IF @SP_Use = 3 -- for ADDING privileges, FILL GRID with ALL projects so can add which ones they need
'BEGIN()
' SELECT
' P.JobNo AS [Job No],
' P.ProjNo AS [Project No],
' P.ProjName AS [Project Name]
' FROM Projects P JOIN User_Projects UP ON P.JobNo = UP.JobNo
' WHERE P.Deleted = 0 and P.Active = 1
' ORDER BY UP.UserID, P.JobNo
'End
'for adding privs, need to show all projects
sqlCmd.Parameters.Add(New SqlParameter("@SP_Use", 3))
sqlCmd.Parameters.Add(New SqlParameter("@UName", DBNull.Value))
sqlCmd.Parameters.Add(New SqlParameter("@Active", DBNull.Value))
sqlCmd.Parameters.Add(New SqlParameter("@Admin", DBNull.Value))
sqlCmd.ExecuteNonQuery()
'use DataAdapter to fill datatable
Dim sqlDA As New SqlDataAdapter()
sqlDA.SelectCommand = sqlCmd
Dim table As New DataTable
sqlDA.Fill(table)
grdAddProjectPrivs.DataSource = table
sqlDA.Dispose()
'reading to get userid to checkboxes accordingly
Dim userID As New SqlCommand("SELECT JobNo FROM User_Projects WHERE PT_User = '" & cmbAddUName.Text & "'", frmConnect.DB)
Dim dr As SqlDataReader = userID.ExecuteReader()
'****THIS IS WHERE I THINK I NEED HELP!!!!
While dr.Read()
If dr.HasRows = True Then
If grdAddProjectPrivs.Columns.Contains(dr("JobNo")) Then
For Each row As DataGridViewRow In grdAddProjectPrivs.Rows
row.Cells("Add").Value = True
Next
End If
End If
End While
dr.Close()
End Sub
Private Sub btnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
'HERE I AM LOOKING TO UPDATE THE DATABASE BY ADDING THE USER'S UserID number TO THAT SPECIFIC PROJECT THAT THEY CHECK OFF WITH THE CHECKBOX.
'i'm thinking once i get the gist of manipulating the checkboxes down pat i can figure this out but if there is anything additional i need to know please advise?
End Sub
End Class
SQL 表布局细分： USER_PROJECTS TABLE CONSISTS OF (UserID, UserName, JobNo); 项目表由（UserID、JobNo、ProjNo、ProjName）组成