[Solved] Check if text string is Numeric or AlphaNumeric using C# .Net

Please refer this

Enter Text:
<asp:TextBox ID="txtText" runat="server"></asp:TextBox>
<br />
<br />
<asp:Button ID="btnSubmit" runat="server" OnClick="Validate_AlphanumericOrNumeric"
    Text="Validate" />

C#

protected void Validate_AlphanumericOrNumeric(object sender, EventArgs e)
{
    System.Text.RegularExpressions.Regex numeric = new System.Text.RegularExpressions.Regex("^[0-9]+$");
    System.Text.RegularExpressions.Regex alphanemeric = new System.Text.RegularExpressions.Regex("^[a-zA-Z0-9]*$");
    System.Text.RegularExpressions.Regex alphabets = new System.Text.RegularExpressions.Regex("^[A-z]+$");
    string IsAlphaNumericOrNumeric = string.Empty;
    if (numeric.IsMatch(txtText.Text))
    {
        isAlphanumericOrNumeric = "Numeric only";
    }
    else
    {
        if (alphabets.IsMatch(txtText.Text))
        {
            isAlphanumericOrNumeric = "Alphabet only";
        }
        else if (alphanemeric.IsMatch(txtText.Text))
        {
            isAlphanumericOrNumeric = "Alphanumeric";
        }
    }


    ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert(' Entered text is  " + isAlphanumericOrNumeric + "')", true);
}