problem with executing execute scaller in object oriented approach

Error	26	'dbcon.ohh(string)': not all code paths return a value	

public int ohh(String query)
        {
            int c; 
            try
            {
                MAconn = new SqlConnection();
                MAconn.ConnectionString = connectionString;
                MAconn.Open();

                MAcmd = MAconn.CreateCommand();
                MAcmd.CommandText = query;
                c =(int)MAcmd.ExecuteScalar();
                MAconn.Close();
                return c;


            }

<pre>string query= "Select Count(*) FROM roles inner join users on roles.UserID=users.UserID inner join groups on roles.GroupID =groups.GroupID where username ='" + txtusername.Text + "' AND RoleName = '" + DropDownList1.Text + "'";
        int count = obj.ohh(query);
        if (count > 0)
        {
            Label1.Text = "record exits";
        }
        else
        {
            string query = "INSERT INTO ROLES (UserId,GroupId) SELECT UserId,GroupId FROM Users, Groups WHERE username= '" + txtusername.Text + "' AND RoleName='" + DropDownList1.Text + "'";
            bool b=obj.UDI(query);
            
            if (b)
            {
                lblresult.Text = "Inserted";
                //Response.Redirect("Products.aspx");
            }
            else
            {

                lblresult.Text = "Not Inserted";
            }