How to change the Date Format in GridView BoundField and Label ASP.Net

Please refer this link your doubt will be clear

Format: {0:d}

Means

6/15/2009 1:45:30 PM -> 6/15/2009

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DataFormatString="{0:ddd MM, yyyy}

Means

 Wed 07,2014

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.boundfield.dataformatstring%28v=vs.110%29.aspx

HTML

<form id="form1" runat="server">
<div>
    <asp:GridView ID="gvDates" runat="server" AutoGenerateColumns="false" Width="500">
        <Columns>
            <asp:BoundField DataField="Date" DataFormatString="{0:ddd MM, yyyy}" HtmlEncode="false"
                HeaderText="ddd MM, yyyy" />
            <asp:BoundField DataField="Date" HeaderText="M-dd-yyyy" SortExpression="ModifiedDate"
                DataFormatString="{0:d}" />
            <asp:TemplateField HeaderText="MM-dd-yyyy">
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Eval("Date", "{0:MM-dd-yyyy}") %>'>
                    </asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</div>
</form>

Namespace

using System.Data;

 C#

protected void Page_Load(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.Add("Date", typeof(DateTime));
    dt.Rows.Add(DateTime.Now);
    this.gvDates.DataSource = dt;
    this.gvDates.DataBind();
}

Screenshot