how to bind a dropdownlist in gridview? - asp.net

Question

I have a gridview in which every row contains a dropdownlist. I want to bind every dropdownlist dynamically. Can someone tell me how can i do it. Thanks in Advance

Answer 1

If you are using template column then you can bind your drop-down from mark-up using data-binding expressions. For example,
<asp:TemplateField HeaderText="XYZ">
<ItemTemplate>
<asp:DropDownList runat="server" ID="MyDD" DataSourceId="MyDataSource" />
</ItemTemplate>
</asp:TemplateField>
Above is assuming that your drop-down data in constant across rows. If it is changing then you can use data-binding expression such as
<asp:DropDownList runat="server" DataSource='<%# GetDropDownData(Container) %>' DataTextField="Text" DataValueField="Value" />
GetDropDownData will be a protected method in code-behind that will return the data (data-table, list, array) for the given row.
You can use GridView.RowDataBound event (or RowCreated event) in code-behind to fill drop-downs. For example,
protected void GridView_RowDataBound(Object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
// Find the drop-down (say in 3rd column)
var dd = e.Row.Cells[2].Controls[0] as DropDownList;
if (null != dd) {
// bind it
}
/*
// In case of template fields, use FindControl
dd = e.Row.Cells[2].FindControl("MyDD") as DropDownList;
*/
}
}

Answer 2

In addition to the proposed methods, you may also bind your controls within your markup, in this way:
<asp:GridView ID="MyGrid" runat="server" DataSourceID="MyDataSource1">
<Columns>
<asp:TemplateField>
<EditItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" SelectedValue='<%# Bind ("CustomerId") %>' DataSourceID="CustomersDataSource" DataTextField="CustomerName" DataValueField="CustomerId" >
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

Answer 3

Here is your gridview
<asp:GridView ID="grvExcelData" runat="server" onrowdatabound="GridView2_RowDataBound">
<HeaderStyle BackColor="#df5015" Font-Bold="true" ForeColor="White" />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:DropDownList ID="DrdDatabase" Width="100px" runat="server">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
and your RowDataBound event for the gridview would be
protected void GridView2_RowDataBound(object sender, GridViewRowEventArgs e)
{
string cities = "maxico,chennai,newdelhi,hongkong";
string [] arr = cities.Split(',');
// Instead of string array it could be your data retrieved from database.
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddl = (DropDownList)e.Row.FindControl("DrdDatabase");
foreach (string colName in arr )
ddl.Items.Add(new ListItem(colName));
}
}

Answer 4

protected void gvSalesAppData_RowDataBound(Object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddlCurrentPhase = (DropDownList)e.Row.FindControl("ddlCurrentPhase");
DropDownList ddlProductFamily = (DropDownList)e.Row.FindControl("ddlProductFamily");
DropDownList ddlProductGroup = (DropDownList)e.Row.FindControl("ddlProductGroup");
DropDownList ddlETProgramManager = (DropDownList)e.Row.FindControl("ddlETProgramManager");
DropDownList ddlPLMForTheProduct = (DropDownList)e.Row.FindControl("ddlPLMForTheProduct");
TrackingToolObj.BindCurrentPhases(ddlCurrentPhase);
TrackingToolObj.BindCurrentPhases(ddlProductFamily);
TrackingToolObj.BindProductGroups(ddlProductGroup);
TrackingToolObj.GetEmployeesBasedOnRoleTypeId(ddlETProgramManager, (int)OSAEnums.RoleTypes.ProgramManager, false);
TrackingToolObj.GetEmployeesBasedOnRoleTypeId(ddlPLMForTheProduct, (int)OSAEnums.RoleTypes.PLM, false);
}
}

Answer 5

Binding the GridView
Below is the code to Bind the GridView control with data.
C#
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.BindData();
}
}
private void BindData()
{
string query = "SELECT top 10 * FROM Customers";
SqlCommand cmd = new SqlCommand(query);
gvCustomers.DataSource = GetData(cmd);
gvCustomers.DataBind();
}
private DataTable GetData(SqlCommand cmd)
{
string strConnString = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;
using (SqlConnection con = new SqlConnection(strConnString))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.Connection = con;
sda.SelectCommand = cmd;
using (DataTable dt = new DataTable())
{
sda.Fill(dt);
return dt;
}
}
}
}