how to allow only character value ?

Question

1.00/5 (1 vote)

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VB

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text <> " " Then
            ListBox1.Items.Add(TextBox1.Text)
            TextBox1.Text = " "
    End If
    End Sub
End Class

Posted 13-Feb-14 18:53pm

Member 10595798

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Sergey Alexandrovich Kryukov 14-Feb-14 0:58am

Very bad unreliable code. What do you want to achieve? So far, the question does not make any sense at all...
—SA

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sohail awr · Answer 1 · 2014-02-13T23:04:00

Method 1

VB

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       If TextBox1.Text.Trim <> "" Then
           If Char.IsLetter(Me.TextBox1.Text) Then
               ListBox1.Items.Add(TextBox1.Text)
               TextBox1.Text = ""
           Else
               MsgBox("Please enter characters only", MsgBoxStyle.Exclamation, "Character Alert")
           End If
       End If
   End Sub

Method 2

VB

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text.Trim <> "" Then
                           ListBox1.Items.Add(TextBox1.Text)
                TextBox1.Text = ""
                  End If
    End Sub

    Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        Check_character(e)
    End Sub

    Sub Check_character(ByVal e As System.Windows.Forms.KeyPressEventArgs)
        If Char.IsLetter(e.KeyChar) = False And (Asc(e.KeyChar) <> 13) And (Asc(e.KeyChar) <> 8) And Char.IsWhiteSpace(e.KeyChar) = False Then
            e.Handled = True
            MsgBox("Only Characters Allowed", MsgBoxStyle.Exclamation, "Character Alert")
        End If
    End Sub