C#

private void GetAllMembers()//this will get members belonging to all clubs
        {
            string query = @"SELECT * FROM [member_details] INNER JOIN club_details ON club_details.memberno =  member_details.memberno WHERE [date_added] BETWEEN '" + date_from.SelectedValue.ToString() + "' AND '" + date_to.SelectedValue.ToString() + "'AND primsecconttype = '" + memb_type.SelectedValue.ToString() + "' AND [contracttype] = '" + class_type.SelectedValue.ToString() + "'";
            try
            {
                conn.Close();
                cmd = conn.CreateCommand();
                cmd.CommandText = query;
                conn.Open();
                reader = cmd.ExecuteReader();
                memb_names.Items.Clear();
                while (reader.Read())
                {
                    string firstnames = (string)reader["firstname"];
                    memb_names.Items.Add(firstnames);
                    //ProcessReportViewed();//this will call a method called UpdateReportViewed in the Manager.cs class, it will pass a user_id for this user, go there and see what goes on...
                }
                if (!reader.Read())
                {
                    error.Visible = true;
                    error.Text = "Sorry no mambers found in this range..";
                }
                //else
                //{
                    
                //}
                
                
            }
            catch (SqlException fff)
            {
                error.Visible = true;
                error.Text = "Error occured: " + fff.Message;
            }
        }

<br />
private void btnSave_Click(object sender, EventArgs e)<br />
        {<br />
          string[] FieldName = { "Lastname", "Firstname", "Address", "Model", "Trouble Reported" };<br />
          string messEmptyField;<br />
          int i = 0;<br />
<br />
            foreach (Control ctrl in groupBox1.Controls)<br />
            {<br />
                TextBox txt = ctrl as TextBox;<br />
<br />
                if (txt.Text == string.Empty)<br />
                {<br />
                    messEmptyField += FieldName[i]; //error use of unassigned local variable 'messEmptyField'<br />
                }<br />
                i++;<br />
            }<br />
<br />
            MessageBox.Show(messEmptyField + "please filled up all");<br />
            dtDateLog.Focus();<br />
            return;<br />
        }<br />
<br />
<br />
<br />
<br />

Type tSWApp = Type.GetTypeFromProgID("SldWorks.Application");
object swApp = Activator.CreateInstance(tSWApp);
IDispatch idisp = (IDispatch)swApp;

// Getting the visible property (this part works)
Guid guid = new Guid();
int[] nIds = new int[] { 0 };
nRetVal = idisp.GetIDsOfNames(ref guid, new string[] { "Visible" }, 1, 0, nIds);

DISPPARAMS dispParams = new DISPPARAMS();
dispParams.cArgs = 0;
dispParams.cNamedArgs = 0;
object pVarResult;

System.Runtime.InteropServices.ComTypes.EXCEPINFO excepInfo = new System.Runtime.InteropServices.ComTypes.EXCEPINFO();

nRetVal = idisp.Invoke(nIds[0], ref guid, 0, (ushort)System.Runtime.InteropServices.ComTypes.INVOKEKIND.INVOKE_PROPERTYGET, ref dispParams, out pVarResult, ref excepInfo, null);

// Launching a function with parameters
object[] oArgs = new object[]{ 10 };
nRetVal = idisp.GetIDsOfNames(ref guid, new string[] { "GetUserPreferenceIntegerValue" }, 1, 0, nIds);
dispParams.cArgs = 1;
--> dispParams.rgvarg = ???; <-- Here, I must provide a IntPtr object that represent the array "oArgs" defined above.
dispParams.cNamedArgs = 0;
dispParams.rgdispidNamedArgs = new object[] { };
nRetVal = idisp.Invoke(nIds[0], ref guid, 0, (ushort)System.Runtime.InteropServices.ComTypes.INVOKEKIND.INVOKE_FUNC, ref dispParams, out pVarResult, ref excepInfo, null);