Uncheck ASP.Net GridView Rows based on condition using C# and VB.Net

Hey dorsa,

Please refer below sample.

HTML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
    <Columns>
        <asp:TemplateField HeaderText="select">
            <ItemTemplate>
                <asp:CheckBox ID="chkSelect" runat="server" OnCheckedChanged="OnCheckedChanged" AutoPostBack="true" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="RoomTitle" HeaderText="RoomTitle" />
        <asp:BoundField DataField="DayWeek" HeaderText="DayWeek" />
        <asp:BoundField DataField="EndDate" HeaderText="EndTime" />
        <asp:BoundField DataField="StartDate" HeaderText="  StartTime" />
        <asp:BoundField DataField="ProfessorLastName" HeaderText="ProfessorLastName" />
        <asp:BoundField DataField="ProfessorFirstName" HeaderText="ProfessorName" />
        <asp:BoundField DataField="LessonCode" HeaderText="LessonCode" />
        <asp:BoundField DataField="LessonTitle" HeaderText="LessonTitle" />
    </Columns>
</asp:GridView>

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        this.GridView1.DataSource = GetData();
        this.GridView1.DataBind();
    }
}

private DataTable GetData()
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[] { 
                        new DataColumn("LessonTitle", typeof(string)),
                        new DataColumn("LessonCode", typeof(string)), 
                        new DataColumn("ProfessorFirstName", typeof(string)), 
                        new DataColumn("ProfessorLastName", typeof(string)), 
                        new DataColumn("StartDate", typeof(string)), 
                        new DataColumn("EndDate", typeof(string)), 
                        new DataColumn("DayWeek", typeof(string)),
                        new DataColumn("RoomTitle", typeof(string)) });
    dt.Rows.Add("mathematical1", "962001", "john", "leni", "10:00:00", "11:30:00", "Saturday", "201");
    dt.Rows.Add("mathematical1", "962001", "john", "leni", "09:00:00", "10:30:00", "Sunday", "201");
    dt.Rows.Add("mathematical1", "962001", "john", "leni", "11:00:00", "12:30:00", "Monday", "201");
    dt.Rows.Add("mathematical1", "962216", "ali", "brn", "14:00:00", "16:30:00", "Saturday", "202");
    dt.Rows.Add("mathematical1", "962216", "ali", "brn", "16:30:00", "18:00:00", "Tuesday", "301");
    dt.Rows.Add("operating System", "962101", "sara", "kan", "08:00:00", "09:00:00", "Tuesday", "301");

    return dt;
}

protected void OnCheckedChanged(object sender, EventArgs e)
{
    GridViewRow selectedRow = (sender as CheckBox).NamingContainer as GridViewRow;
    string lessionName = selectedRow.Cells[8].Text;
    string firstName = selectedRow.Cells[6].Text;
    if ((sender as CheckBox).Checked)
    {
        DataRow[] dr = GetData().Select("ProfessorFirstName='" + firstName + "' AND LessonTitle = '" + lessionName + "'");
        if (dr.Length > 1)
        {
            foreach (GridViewRow row in GridView1.Rows)
            {
                string lession = row.Cells[8].Text;
                string name = row.Cells[6].Text;
                if (lessionName.ToLower().Trim() == lession.ToLower().Trim() && firstName.ToLower().Trim() == name.ToLower().Trim())
                {
                    (row.FindControl("chkSelect") as CheckBox).Checked = true;
                }
            }
        }
        else
        {
            (sender as CheckBox).Checked = false;
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Me.GridView1.DataSource = GetData()
        Me.GridView1.DataBind()
    End If
End Sub

Private Function GetData() As DataTable
    Dim dt As DataTable = New DataTable()
    dt.Columns.AddRange(New DataColumn() {New DataColumn("LessonTitle", GetType(String)), New DataColumn("LessonCode", GetType(String)), New DataColumn("ProfessorFirstName", GetType(String)), New DataColumn("ProfessorLastName", GetType(String)), New DataColumn("StartDate", GetType(String)), New DataColumn("EndDate", GetType(String)), New DataColumn("DayWeek", GetType(String)), New DataColumn("RoomTitle", GetType(String))})
    dt.Rows.Add("mathematical1", "962001", "john", "leni", "10:00:00", "11:30:00", "Saturday", "201")
    dt.Rows.Add("mathematical1", "962001", "john", "leni", "09:00:00", "10:30:00", "Sunday", "201")
    dt.Rows.Add("mathematical1", "962001", "john", "leni", "11:00:00", "12:30:00", "Monday", "201")
    dt.Rows.Add("mathematical1", "962216", "ali", "brn", "14:00:00", "16:30:00", "Saturday", "202")
    dt.Rows.Add("mathematical1", "962216", "ali", "brn", "16:30:00", "18:00:00", "Tuesday", "301")
    dt.Rows.Add("operating System", "962101", "sara", "kan", "08:00:00", "09:00:00", "Tuesday", "301")
    Return dt
End Function

Protected Sub OnCheckedChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim selectedRow As GridViewRow = TryCast((TryCast(sender, CheckBox)).NamingContainer, GridViewRow)
    Dim lessionName As String = selectedRow.Cells(8).Text
    Dim firstName As String = selectedRow.Cells(6).Text
    If (TryCast(sender, CheckBox)).Checked Then
        Dim dr As DataRow() = GetData().[Select]("ProfessorFirstName='" & firstName & "' AND LessonTitle = '" & lessionName & "'")
        If dr.Length > 1 Then
            For Each row As GridViewRow In GridView1.Rows
                Dim lession As String = row.Cells(8).Text
                Dim name As String = row.Cells(6).Text
                If lessionName.ToLower().Trim() = lession.ToLower().Trim() AndAlso firstName.ToLower().Trim() = name.ToLower().Trim() Then
                    TryCast(row.FindControl("chkSelect"), CheckBox).Checked = True
                End If
            Next
        Else
            TryCast(sender, CheckBox).Checked = False
        End If
    End If
End Sub

Screenshot