delete records in gridview using checkbox

hi
refer this link
Delte records using check box in grid view in asp.net[^]

Please refer answer for similar question,
Delete rows from datgridview and database access[^]
You will get some help from it, for sure.

Grid View add Checkbox like below

<asp:TemplateField HeaderText="Select">
                                                                                            <ItemTemplate>
                                                                                                <asp:CheckBox ID="chkBxSelect" runat="server" />
                                                                                            </ItemTemplate>
                                                                                            <HeaderTemplate>
                                                                                                <asp:CheckBox ID="chkBxHeader" onclick="javascript:HeaderClick(this);" runat="server" />
                                                                                            </HeaderTemplate>
                                                                                        </asp:TemplateField>

<script type="text/javascript">
        var TotalChkBx;
        var Counter;
        

        window.onload = function () {
            //Get total no. of CheckBoxes in side the GridView.
            TotalChkBx = parseInt('<%= this.GridviewID.Rows.Count %>');
           

            //Get total no. of checked CheckBoxes in side the GridView.
            Counter = 0;
           
        }

        function HeaderClick(CheckBox) {
            //Get target base & child control.
            var TargetBaseControl =
       document.getElementById('<%= this.GridviewID.ClientID %>');
            var TargetChildControl = "chkBxSelect";

            //Get all the control of the type INPUT in the base control.
            var Inputs = TargetBaseControl.getElementsByTagName("input");

            //Checked/Unchecked all the checkBoxes in side the GridView.
            for (var n = 0; n < Inputs.length; ++n)
                if (Inputs[n].type == 'checkbox' &&
                Inputs[n].id.indexOf(TargetChildControl, 0) >= 0)
                    Inputs[n].checked = CheckBox.checked;

            //Reset Counter
            Counter = CheckBox.checked ? TotalChkBx : 0;
        }

        function ChildClick(CheckBox, HCheckBox) {
            //get target control.
            var HeaderCheckBox = document.getElementById(HCheckBox);

            //Modifiy Counter;
            if (CheckBox.checked && Counter < TotalChkBx)
                Counter++;
            else if (Counter > 0)
                Counter--;

            //Change state of the header CheckBox.
            if (Counter < TotalChkBx)
                HeaderCheckBox.checked = false;
            else if (Counter == TotalChkBx)
                HeaderCheckBox.checked = true;
        }

Insert Delete delete button for gridview outside
<asp:button id="btnDelete" runat="server" text="Delete" onclick="btnDelete_Click" xmlns:asp="#unknown">

string flagchecked = "0";
ArrayList arrriskid = new ArrayList();
// Select the checkboxes from the GridView control
for (int i = 0; i < GridviewID.Rows.Count; i++)
{
GridViewRow row = GridviewID.Rows[i];
bool isChecked = ((CheckBox)row.FindControl("chkBxSelect")).Checked;

if (isChecked)
{
flagchecked = "1";
string deleteid= ((Label)row.FindControl("itemteplatedeleteid")).Text;
arrriskid.Add(deleteid);
}
}
if (flagchecked == "1")
{
for (int jR = 0; jR < arrriskid.Count; jR++)
{
dt_Datatable = (DataTable)Session["dt_Datatable "];
if (dt_Datatable .Rows.Count > 0)
{
//use loop must reverse order its may helps to avoide error when deleting rows in dt_Datatable
int loopcount = dt_Datatable .Rows.Count - 1;
for (int j = loopcount; j >= 0; j--)
{
if (dt_Datatable.Rows[j]["DeleteID"].ToString() == arrriskid[jR].ToString())
{

dt_Datatable .Rows[j].Delete();
dt_Datatable .AcceptChanges();
}
}

}

Then Last bind gridview again from Datatable

G<pre lang="xml">GridviewID.DataSource = dt_<pre lang="xml">Datatable ;
               GridviewID.DataBind();&lt;/pre&gt;</pre>