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C# Tricks

Datable

Read a Column

Select the row and then ask for the field.

  • DataTable requestedTags;
  • requestedTags.Rows[0]["status"]

GridView

Add a field

  • To add a field beyond the result of your query use <asp:TemplateField>
               <asp:TemplateField HeaderText="New On Board Week">
                        <ItemTemplate>
                            <asp:DropDownList ID="ddlChange" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlChange_SelectedIndexChanged">
                                <asp:ListItem>--Change in:--</asp:ListItem>
                                <asp:ListItem>User</asp:ListItem>
                                <asp:ListItem>Plates</asp:ListItem>
                                <asp:ListItem>Car</asp:ListItem>
                            </asp:DropDownList>
                        </ItemTemplate>

                    </asp:TemplateField>

Add a button and define its action

  • Add the button in the gridView
  • Define the CommmandName
    • <asp:ButtonField ButtonType="Button" Text="Select" CommandName="Select"  />
  • Define in the gridView the property OnRowCommand="grdData_RowCommand"
  • In the code part create the method that you define in the OnRowCommand 
    • To filter the commands inside the method
 if (e.CommandName == "Select")
            {

           }

Know row index


  • Inside the method of the element inside the GridView
    • Cast the sender to your element type
    • From that cast element call the Parent two times to get the GridViewRow
    • Now call from the GridViewRow the property RowIndex
protected void ddlActivity_SelectedIndexChanged(object sender, EventArgs e)
    {

        DropDownList ddlCurrentDropDownList = (DropDownList)sender;
        GridViewRow grdrDropDownRow = ((GridViewRow)ddlCurrentDropDownList.Parent.Parent);

        if (String.Compare(ddlCurrentDropDownList.SelectedItem.Value, "-1") != 0)
        {
            DropDownList ddlSubactivity = (DropDownList)gvCreateProject.Rows[grdrDropDownRow.RowIndex].Cells[2].FindControl("ddlSubactivity");
            ddlSubactivity.Enabled = true;
            FillSubactivityDdl(ddlSubactivity, Convert.ToInt32(ddlCurrentDropDownList.SelectedValue));
        }
    }

Add a scraoll

Put the gridview inside a div

<div style="overflow:scroll; height: 100%; width: 100%">
  <asp:GridView ......></asp:GridView>
</div>



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