Hi RichardSa,

Use repeater ItemDataBound event.

Refer below sample.

Database

CREATE TABLE [dbo].[tblFiles](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [Name] [varchar](50) NOT NULL,
    [ContentType] [nvarchar](200) NOT NULL,
    [Data] [varbinary](max) NULL,
 CONSTRAINT [PK_tblFiles] PRIMARY KEY CLUSTERED
(
    [id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

I have inserted few record in the table.

For more details on insert refer below article.

How to save ( insert ) Image in Database in ASP.Net using C# and VB.Net

HTML

<asp:Repeater ID="rpttblFiles" runat="server" OnItemDataBound="OnItemDataBound">
    <ItemTemplate>
        <asp:TableRow>
            <asp:TableCell>
                <div class="col-md-5" style="max-width: 50%; height: auto;">
                    <asp:Label ID="lblName" runat="server" Text='<%# Eval("Name") %>' /><br />
                    <asp:Image ID="imgPhoto" runat="server" Height="100" Width="100" />
                    <hr />
                </div>
            </asp:TableCell>
        </asp:TableRow>
    </ItemTemplate>
</asp:Repeater>

Namespaces

C#

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

VB.Net

Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(conString))
        {
            using (SqlCommand cmd = new SqlCommand("SELECT * FROM tblFiles"))
            {
                cmd.Connection = con;
                using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
                {
                    DataTable dt = new DataTable();
                    sda.Fill(dt);
                    rpttblFiles.DataSource = dt;
                    rpttblFiles.DataBind();
                }
            }
        }
    }
}
protected void OnItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        Image img = e.Item.FindControl("imgPhoto") as Image;
        DataRowView dr = (DataRowView)e.Item.DataItem;
        if (!Convert.IsDBNull(dr["Data"]))
        {
            string imageUrl = "data:image/jpg;base64," + Convert.ToBase64String((byte[])dr["Data"]);
            img.ImageUrl = imageUrl;
            img.Visible = true;
        }
        else
        {
            img.Visible = false;
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Using con As SqlConnection = New SqlConnection(conString)
            Using cmd As SqlCommand = New SqlCommand("SELECT * FROM tblFiles")
                cmd.Connection = con
                Using sda As SqlDataAdapter = New SqlDataAdapter(cmd)
                    Dim dt As DataTable = New DataTable()
                    sda.Fill(dt)
                    rpttblFiles.DataSource = dt
                    rpttblFiles.DataBind()
                End Using
            End Using
        End Using
    End If
End Sub
Protected Sub OnItemDataBound(ByVal sender As Object, ByVal e As RepeaterItemEventArgs)
    If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType = ListItemType.AlternatingItem Then
        Dim img As Image = TryCast(e.Item.FindControl("imgPhoto"), Image)
        Dim dr As DataRowView = CType(e.Item.DataItem, DataRowView)
        If Not Convert.IsDBNull(dr("Data")) Then
            Dim imageUrl As String = "data:image/jpg;base64," & Convert.ToBase64String(CType(dr("Data"), Byte()))
            img.ImageUrl = imageUrl
            img.Visible = True
        Else
            img.Visible = False
        End If
    End If
End Sub

Screenshot