Refer this
C#
protected void Page_Load(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.Add("Price", typeof(float));
    DataRow dr = dt.NewRow();
    dr["Price"] = 12.5;
    dt.Rows.Add(dr);
}
VB
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
   Dim dt As New DataTable()
   dt.Columns.Add("Price", GetType(Single))
   Dim dr As DataRow = dt.NewRow()
   dr("Price") = 12.5
   dt.Rows.Add(dr)
End Sub
Thank You.