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exception error in customise dropdown combo

Posted By:      Posted Date: October 22, 2010    Points: 0   Category :Windows Application
 

i create a user control of dropdown combo, it contains one textbox, datagridview and button.  when i add this dropdown combo (compile to DLL)  to another project, everything running fine, but problem is when i first load the form and try to keyin something in textbox, it comes out error 'object not set to an instance object' ...this error only come out when first load form, if i didn't keyin anything in the textbox but i click the dropdown and select the value, that can work, and if i delete the textbox value and re-keyin , its also ok,  its's just that when i close the form and then load the first time and keyin text, error comes out.

i suspect it is the textbox_textchanged event problem, because when i delete off the code here, its ok, but i can't do that cos i need to do the dataview rowfilter.  below is the sourcecode:

in the usercontrolcombo.designer.cs :

        private System.Windows.Forms.TextBox textBox1;

        public string txtBox
        {
            get { return textBox1.Text; }
            set { textBox1.Text = value; }
        }

 




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