Hi I need to use regular expressions in C# to validate a TextBox.

Regular expressions should validate that the textbox has one number and one uppercase letter

My code is:

```
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" 
    ControlToValidate="TextBox1" ErrorMessage="RegularExpressionValidator" 
    ValidationExpression="[A-Z a-z 0-9]*[0-1]+[A-z]+"></asp:RegularExpressionValidator>

```

but it's not allowing 

```
nameA123

```

Where is my error?