Delete Row From asp GridView and From Datatable

Question

I have asp gridview which is bind with a datatable. Only one template column that is checkbox is bind with source datatable column (sel).

Here is markup example:

<asp:GridView  ID="testGrid"  
                CssClass="ObjSelection" 
                AutoGenerateColumns="false" 
                OnRowDataBound="testGrid_RowDataBound"
                runat="server">
 <Columns>
     <asp:TemplateField HeaderText="&nbsp">
        <HeaderTemplate>
           <asp:CheckBox ID="chkAll" runat="server" Enabled="true" AutoPostBack="true" />
        </HeaderTemplate>
        <ItemTemplate>
            <asp:CheckBox AutoPostBack="true" ID="chkRow" runat="server" Checked='<%# DataBinder.Eval(Container.DataItem, "sel")%>' OnCheckedChanged="ChkRow_OnCheckChange" />
        </ItemTemplate>
     </asp:TemplateField>                                   

 </Columns>
</asp:GridView>

As you see, I am not using RowCommand to delete a row. I have a toolbar in a separate div, which shows delete button.

Can you guide how could I delete a row both from DataSource and GridView on a button click which exists in another div?

Answer 1

Use below code to remove selected row from datatable which is either in ViewState or in Session and assign data source

Aslo assign datakey to GridView

<asp:GridView  ID="testGrid"    DataKeyNames="PrimaryKey" 
                CssClass="ObjSelection" 
                AutoGenerateColumns="false" 
                OnRowDataBound="testGrid_RowDataBound"
                runat="server">

Code Behind:

protected void btnRemove(object sender, EventArgs e)
    {
        // Check session exists 
        if (Session["Key"] != null)
        {
            // Opening / Retreiving DataTable.
            DataTable dt = (DataTable)Session["Key"];

            foreach (GridViewRow row in testGrid.Rows)
            {
                CheckBox chkRow= row.Cells[0].FindControl("chkRow") as CheckBox;

                if (chkRow!= null && chkRow.Checked)
                {                    
                    int Id = Convert.ToInt32(testGrid.DataKeys[row.RowIndex].Value); 

                    DataRow[] drs = dt.Select("PrimaryKey = '" + Id + "'"); // replace with your criteria as appropriate

                    if (drs.Length > 0)
                    {
                        dt .Rows.Remove(drs[0]);
                    }
                }
            }

            Session["Key"] = dt ;
            testGrid.DataSource = dt ;
            testGrid.DataBind();
        }
    }