label does not show text when populated

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C#

Hi
I'm having the weirdest problem my label is not showing any values when populated by the ok button in a modalpopup. when I use a breakpoint to check I find that the label is being populated but the value just does not show. and the popup does not disappear when ok or cancel button is clicked it merely gets docked on the form as per design but does pop up again when I hit the target control

protected void btnAddSave_Click(object sender, EventArgs e)
{
    BusinessLogicLayer.QuoteProduct objex = new BusinessLogicLayer.QuoteProduct();
    objex.propProdId = txtProdId.Text;
    objex.propQouteNo = Convert.ToInt32(lblQouteNo.Text);
    objex.propProdDesc = txtProdDesc.Text;
    objex.propFinish = txtFinish.Text;
    objex.propProdQty = Convert.ToInt32(txtQty.Text);
    objex.propProdPrice = Convert.ToDecimal(txtPrice.Text);
    objex.SaveQProd();
    if ( lblFullAmt.Text == string.Empty)
    {
        Famt = Convert.ToDecimal(txtPrice.Text);
    }
    else
    {
        Famt = Convert.ToDecimal(lblFullAmt.Text) + Convert.ToDecimal(txtPrice.Text);
    }
    lblFullAmt.Text = Convert.ToString(Famt * Convert.ToInt32(txtQty.Text)); //it populates fine though 
    LblDep.Text = Convert.ToString(Convert.ToDecimal(lblFullAmt.Text) / 2);

    txtProdlist.Text = txtProdlist.Text + "\r\n" + lblProdIDmod.Text + " " + txtProdDesc.Text + "    " + txtQty.Text + " " + txtFinish.Text + "  " + txtPrice.Text;
    
}