如何在Asp.net Gridview列中为Checkbox添加事件

Question

I have a gridview in asp where i have added first column as checkbox column.Now i want to select this column and get the id values of the row ..But I am not getting how to do it..

This is my Aspx code..

<asp:GridView ID="GridView1" runat="server" OnRowDataBound="GridView1_RowDataBound"
                    AutoGenerateColumns="False" BackColor="LightGoldenrodYellow" 
                    BorderColor="Tan" BorderWidth="1px" CellPadding="2" ForeColor="Black" 
                    GridLines="None">
                    <AlternatingRowStyle BackColor="PaleGoldenrod" />
                    <Columns>
                     <asp:TemplateField>
                            <HeaderTemplate>
                                <asp:CheckBox ID="chkhdr" runat="server" />
                            </HeaderTemplate>
                          <ItemTemplate>
                                <asp:CheckBox ID="chkChild" runat="server" />
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Username">
                            <ItemTemplate>
                                <asp:Label ID="Label1" runat="server" Text='<%# Eval("col0") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Role(Admin)">
                            <ItemTemplate>
                                <asp:CheckBox ID="chkAdmin" runat="server" Checked='<%# Eval("col1") %>' />
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Role(User)">
                            <ItemTemplate>
                                <asp:CheckBox ID="chkUser" runat="server" Checked='<%# Eval("col2") %>' />
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Role(GeneralUser)">
                            <ItemTemplate>
                                <asp:CheckBox ID="chkgen" runat="server" Checked='<%# Eval("col3") %>' />
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>

And here is my code behind file...

protected void BindGridviewData()
{

    var role = from MembershipUser u in Membership.GetAllUsers()
                select new
                {
                    User = u.UserName,
                    Role = string.Join(",", Roles.GetRolesForUser(u.UserName))
                };

    DataTable dTable = new DataTable();
    dTable.Columns.Add("col0", typeof(string));
    dTable.Columns.Add("col1", typeof(bool));
    dTable.Columns.Add("col2", typeof(bool));
    dTable.Columns.Add("col3", typeof(bool));
    foreach (MembershipUser u in Membership.GetAllUsers())
    {
        DataRow dRow = dTable.NewRow();
        dRow[0] = u.UserName;

        string[] roles = Roles.GetRolesForUser(u.UserName);
        dRow[1] = roles.Contains("Admin") ? true : false;
        dRow[2] = roles.Contains("DPAO User") ? true : false;
        dRow[3] = roles.Contains("GeneralUser") ? true : false;
        dTable.Rows.Add(dRow);
    }
    GridView1.DataSource = dTable;
    GridView1.DataBind();
}

Please Guys help me as i have no idea how to accomplish this ...Thanks in advance...

Answer 1

try this,

<asp:TemplateField HeaderText="View">
   <ItemTemplate>
      <asp:CheckBox ID="chkview" runat="server" AutoPostBack="true" OnCheckedChanged="chkview_CheckedChanged" />
   </ItemTemplate>
</asp:TemplateField>

add checkbox change event in aspx.cs page

protected void chkview_CheckedChanged(object sender, EventArgs e)
{
    GridViewRow row = ((GridViewRow)((CheckBox)sender).NamingContainer);
    int index = row.RowIndex;
    CheckBox cb1 = (CheckBox)Gridview.Rows[index].FindControl("chkview");
    string yourvalue = cb1.Text;
    //here you can find your control and get value(Id).

}

Answer 2

If you want Delete record by Button try this:

Add a Button outside of gridview for Delete:

<asp:Button ID="cmdDelete" runat="server" onclick="cmdDelete_Click" Text="Delete" />

Code behind:

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGridviewData();
    }
}
protected void BindGridviewData()
{
    DataTable dTable = new DataTable();
    dTable.Columns.Add("col0", typeof(string));
    dTable.Columns.Add("col1", typeof(bool));
    dTable.Columns.Add("col2", typeof(bool));
    dTable.Columns.Add("col3", typeof(bool));
    foreach (MembershipUser u in Membership.GetAllUsers())
    {
        DataRow dRow = dTable.NewRow();
        dRow[0] = u.UserName;
        string[] roles = Roles.GetRolesForUser(u.UserName);
        dRow[1] = roles.Contains("Admin") ? true : false;
        dRow[2] = roles.Contains("DPAO User") ? true : false;
        dRow[3] = roles.Contains("GeneralUser") ? true : false;
        dTable.Rows.Add(dRow);
    }
    GridView1.DataSource = dTable;
    GridView1.DataBind();
}
protected void cmdDelete_Click(object sender, EventArgs e)
{
    foreach (GridViewRow row in GridView1.Rows)
    {
        CheckBox chk = (CheckBox)row.FindControl("chkChild");
        if (chk.Checked)
        {
            Label username = (Label)row.FindControl("Label1");
            Membership.DeleteUser(username.Text);
            BindGridviewData();
        }
    }
}

Answer 3

You can iterate through gridivew row collection and check whether it has been selected.

Add selected row (or get ID in your case) and do further processing.

Below URL may help you to get started:

http://www.aspsnippets.com/Articles/GridView-with-CheckBox-Get-Selected-Rows-in-ASPNet.aspx

Answer 4

Use the OnCheckedChanged event

<ItemTemplate>
  <asp:CheckBox ID="chkgen" runat="server" Checked='<%# Eval("col3") %>'  
        OnCheckedChanged="chkgen_OnCheckedChanged"/>
</ItemTemplate>

CS:

protected void chkgen_OnCheckedChanged(object sender, EventArgs e)
{
      int selRowIndex = ((GridViewRow)(((CheckBox)sender).Parent.Parent)).RowIndex;
      CheckBox cb = (CheckBox)gridView.Rows[selRowIndex].FindControl("chkgen");

      if (cb.Checked)
      {
             //Perform your logic
      }
}

Answer 5

 protected void GetFillDropdown()
    {
        string consString = ConfigurationManager.ConnectionStrings["SheetalAcademy"].ConnectionString;
        SqlConnection conn = new SqlConnection(consString);

        int EID = Convert.ToInt32(Session["EmailID"].ToString());
        SqlCommand cmd = new SqlCommand("Select id,Course_Name from tbl_Courses where EID='" + EID + "' and Active='True'", conn);
        conn.Open();
        ddCourseType.Items.Clear();
        ddCourseType.Items.Add("All");
        ddCourseType.AppendDataBoundItems = true;
        ddCourseType.DataSource = cmd.ExecuteReader();
        ddCourseType.DataTextField = "Course_Name";
        ddCourseType.DataValueField = "id";
        ddCourseType.DataBind();
        conn.Close();

    }