creating a search button

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Am trying to create a search button on my form which uses values from a comboBox as its primary key. but i get the error message cannot convert from 'System.Windows.Forms.ComboBox' to 'string'. What should i do
In the class I have this

C#

public bool searchstaffsalarypaymentDetails(string salaryid, string salarypurpose, string salaryyears, string salarymonths)
        {
            SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);

Behind the form I have this

C#

private void lklSearch5_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            try
            {
                clsStaffsalarypayment person5 = new clsStaffsalarypayment();

                if (person5.searchstaffsalarypaymentDetails(cboStaffid5, cboPurpose, cboMonth, cboYear))
                {
                    var
                    _with5 = this;
                    _with5.cboStaffid5.Text = person5.ID5.ToString();

Posted 28-May-12 19:23pm

mikeoabban

Updated 28-May-12 19:25pm

JF2015

v2

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**JF2015** · Answer 1 · 2012-05-28T19:27:00

Solution 1

The error message occurs since you are not using the ComboBox value for the searchstaffsalarypaymentDetails method, but the ComboBox itself.
Maybe you should rewrite it as:

C#

person5.searchstaffsalarypaymentDetails(cboStaffid5.SelectedItem.ToString(), cboPurpose.SelectedItem.ToString(), cboMonth.SelectedItem.ToString(), cboYear.SelectedItem.ToString()))

Posted 28-May-12 19:27pm

JF2015

Updated 28-May-12 19:28pm

v2

Comments

mikeoabban 29-May-12 2:53am

it worked but after run the program and click on the search button i get this
message object reference not set to an instance of an object
pls what should ido

JF2015 29-May-12 3:06am

Make sure that the comboBoxes.SelectedItem is not NULL. You should add a check before calling your procedure, or simply select one items like:
cboStaffid5.SelectedIndex = 0;