Member Avatar for vigneshkbv

in my masked text box, the mask property is setting like aa aa aa issue is, the mouse cursor is not setting the initial character automatically,when i click the mask text box..pls help me.. Thanks in advance....

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  • Latest Post Latest Post by Mitja Bonca

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described a common WinForms MaskedTextBox gotcha: the Mask itself is fine (as demonstrated), but clicking the control doesn't always put the caret on the first editable slot. The control places the caret at the clicked position (which can land on a literal or a prompt char), and focus/selection logic that runs after the click can override manual positioning. was right to ask for clarification — behavior depends on focus vs mouse events.

A reliable fix is to move the caret to the first editable position after the control finishes its default focus/click handling. Use the MaskedTextProvider to find that index and set SelectionStart inside a deferred call (BeginInvoke) so the control’s own processing finishes first:

private void maskedTextBox1_Enter(object sender, EventArgs e)
{
    BeginInvoke((MethodInvoker)delegate
    {
        var mp = maskedTextBox1.MaskedTextProvider;
        int first = mp.FindEditPositionFrom(0, true);
        if (first >= 0)
        {
            maskedTextBox1.SelectionStart = first;
            maskedTextBox1.SelectionLength = 0;
        }
    });
}

For a different UX, selecting the whole field on focus is simpler and often desirable:

private void maskedTextBox1_Enter(object sender, EventArgs e)
{
    BeginInvoke((MethodInvoker)delegate { maskedTextBox1.SelectAll(); });
}

Notes and troubleshooting: Start with the Enter event (BeginInvoke ensures the selection isn’t stomped by internal logic). Using Click or MouseDown can be fragile because default mouse handling runs after or between those events. Verify PromptChar isn’t a space and check properties like HidePromptOnLeave / ResetOnPrompt / ResetOnSpace if prompt/literal behavior looks odd. If this is a web page (ASP.NET) rather than WinForms, the solution requires a client-side mask library instead.

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Member Avatar for IdanS

Please explain little better, because I didnt understood what you need.

Member Avatar for Mitja Bonca

I did it like:

public Form1() //constructor
        {
            InitializeComponent();
            maskedTextBox1.Mask = "aa aa aa aa";
        }

and it works fine.

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