Bind Drop-down with SharePoint List and display list items in a Gridview

In this blog, I will explain about below point through C# code:
1. Bind all list in a dropdown
2 Load List items in a Gridview once a user changes list name in dropdown.

You need to create a visual webpart in Visual studio 2010.

Visual WebPart ASCX code:

<asp:DropDownList ID=”ddlList” AutoPostBack=”true” runat=”server” 
    <asp:Label ID=”lblItemCount” runat=”server” Text=””></asp:Label>
<asp:GridView ID=”gvListItem” AutoGenerateColumns=”false” runat=”server”>

Visual Webpart .ascx.cs code:

Add below name space:

using Microsoft.SharePoint;

 protected void Page_Load(object sender, EventArgs e)
            if (!IsPostBack)
                var web = SPContext.Current.Web;
                ddlList.DataSource = web.Lists;
                ddlList.DataTextField = “Title”;

        protected void ddlList_SelectedIndexChanged(object sender, EventArgs e)
            var web = SPContext.Current.Web;
            var list = web.Lists[ddlList.SelectedItem.Text];
            lblItemCount.Text = list.Items.Count.ToString();
            gvListItem.DataSource = list.Items.GetDataTable();


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