Question

i have a form created using Visual Basic 2008 in c#
i want to add a button that when clicked, it will check multiple fields which if contains text then paste it into other text boxes if they are empty
this is the code i currently have, but its not working

 private void btnCopytoBAN_Click(object sender, EventArgs e)
    {
        if (BAddress.Text.Length < 0)
        {BAddress.Text = MAddress.Text;}
        else
        if (BCity.Text.Length < 0)
        {BCity.Text = MCity.Text;}
        else
        if (BState.Text.Length < 0)
        {BState.Text = MState.Text;}
        else
        if (BZIP.Text.Length < 0)
        {BZIP.Text = MZIP.Text;}
        else
        if (BEmail.Text.Length < 0)
        {BEmail.Text = MEmail.Text;}
        else
        if (BName.Text.Length < 0)
        {BName.Text = MFName.Text + " " + MLName.Text;}
        else
        if (TEmail.Text.Length < 0)
        {TEmail.Text = MEmail.Text;}
        else
        if (TName.Text.Length < 0)
        {TName.Text = MFName.Text + " " + MLName.Text;}
        else
        if (MWork.Text.Length < 0)

        if (MWork.Text.Length > 0)
        {BPhone.Text = MWork.Text;
         TPhone.Text = MWork.Text; ;
        }
        else if (MMobile.Text.Length > 0)
        {BPhone.Text = MMobile.Text;
         TPhone.Text = MMobile.Text; ;}
        else if (MHome.Text.Length > 0)
        {BPhone.Text = MHome.Text;
         TPhone.Text = MHome.Text; ;}
    }

Answer 1

thanks everyone for their help, this is the code i am now using which works perfect.

     private void btnCopytoBAN_Click(object sender, EventArgs e)
    {
        if (BAddress.Text.Length == 0)
            BAddress.Text = MAddress.Text;

        if (BCity.Text.Length == 0)
            BCity.Text = MCity.Text;

        if (BState.Text.Length == 0)
            BState.Text = MState.Text;

        if (BZIP.Text.Length == 0)
            BZIP.Text = MZIP.Text;

        if (BEmail.Text.Length == 0)
            BEmail.Text = MEmail.Text;

        if (BName.Text.Length == 0)
            BName.Text = MFName.Text + " " + MLName.Text;

        if (TEmail.Text.Length == 0)
            TEmail.Text = MEmail.Text;

        if (TName.Text.Length == 0)
            TName.Text = MFName.Text + " " + MLName.Text;

        if (BPhone.Text.Length == 0)
        {
            BPhone.Text = MWork.Text;
            if (BPhone.Text.Length == 0)
                BPhone.Text = MMobile.Text;
            if (BPhone.Text.Length == 0)
                BPhone.Text = MHome.Text;
        }

        if (TPhone.Text.Length == 0)
        {
            TPhone.Text = MWork.Text;
            if (TPhone.Text.Length == 0)
                TPhone.Text = MMobile.Text;
            if (TPhone.Text.Length == 0)
                TPhone.Text = MHome.Text;
        }
    }