Hi Vanessa,

For display count add a row below to the table in rdlc report.

1. Right click on the table, selet Insert Row -> Outside Group - Below.

2. Add TextBox in the row below the column you want to display.

After that right click in the TextBox and select Expression...

3. In expression window write the expression.

You can use IF function instead of Switch for multiple condition.

=SUM(
Switch(
    Fields!Country.Value = "UK", 1, 
    Fields!Country.Value = "Mexico", 1
    )
)

Then press Ok.

Using the below article i have binded the report and display the column count based on the expression.

RDLC (Local SSRS) Report ASP.Net Example using DataSet or DataTable in C# VB.Net and Visual Studio 2010

HTML

<asp:ScriptManager runat="server" />
<rsweb:ReportViewer ID="ReportViewer1" runat="server" Width="100%" Height="300" HyperlinkTarget="_blank"></rsweb:ReportViewer>

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ReportViewer1.LocalReport.EnableHyperlinks = true;
        ReportViewer1.ProcessingMode = ProcessingMode.Local;
        ReportViewer1.LocalReport.ReportPath = Server.MapPath("~/Report.rdlc");
        Customers dsCustomers = GetData("SELECT TOP 5 * FROM Customers");
        ReportDataSource datasource = new ReportDataSource("Customers", dsCustomers.Tables[0]);
        ReportViewer1.LocalReport.DataSources.Clear();
        ReportViewer1.LocalReport.DataSources.Add(datasource);
    }
}
private Customers GetData(string query)
{
    string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    SqlCommand cmd = new SqlCommand(query);
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;
            sda.SelectCommand = cmd;
            using (Customers dsCustomers = new Customers())
            {
                sda.Fill(dsCustomers, "DataTable1");
                return dsCustomers;
            }
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        ReportViewer1.LocalReport.EnableHyperlinks = True
        ReportViewer1.ProcessingMode = ProcessingMode.Local
        ReportViewer1.LocalReport.ReportPath = Server.MapPath("~/Report.rdlc")
        Dim dsCustomers As Customers = GetData("SELECT TOP 5 * FROM Customers")
        Dim datasource As ReportDataSource = New ReportDataSource("Customers", dsCustomers.Tables(0))
        ReportViewer1.LocalReport.DataSources.Clear()
        ReportViewer1.LocalReport.DataSources.Add(datasource)
    End If
End Sub

Private Function GetData(ByVal query As String) As Customers
    Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Dim cmd As SqlCommand = New SqlCommand(query)
    Using con As SqlConnection = New SqlConnection(conString)
        Using sda As SqlDataAdapter = New SqlDataAdapter()
            cmd.Connection = con
            sda.SelectCommand = cmd
            Using dsCustomers As Customers = New Customers()
                sda.Fill(dsCustomers, "DataTable1")
                Return dsCustomers
            End Using
        End Using
    End Using
End Function

Screenshot