I am using Visual Studio and c#. I have a form that contains a Developer Express data-aware treelist called treelist1, which has a datasource property.  I created a method to set the datasource property of the treelist: public partial class UserControl1 : UserControl    {     public UserControl1()             {         InitializeComponent();     }             public void SetTreelist1DataSource(System.Data.DataTable dataTable)     {         treeList1.DataSource = dataTable;     } } }  I am trying to set the dataTable property from another class: class DataAccess {     public static void LoadDataSource()     {         string constring = &quot;Default&quot;;         using (SqlConnection cstr = new SqlConnection(constring))         {             using (SqlCommand cmd = new SqlCommand(&quot;SELECT * FROM Customers&quot;, cstr))             {                 cmd.CommandType = CommandType.Text;                 using (SqlDataAdapter sda = new SqlDataAdapter(cmd))                 {                     using (DataTable dt = new DataTable())                     {                         sda.Fill(dt);                         UserControl1.SetTreelist1DataSource(dt);                                                 }                 }             }          }     }  } }  The line UserControl1.SetTreelist1DataSource(dt);  gets the compiler error, &quot;An object reference is required for the nonstatic method, data field or property usercontrol1.settreelist1datasource(datatable)&quot;. Any constructive help would be greatly appreciated. Paul
Consider:  namespace WindowsApplication1 {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }          private void button1_Click(object sender, EventArgs e)         {             //int[] val = { 0, 0};             int val;             if (textBox1.Text == "")             {                 MessageBox.Show("Input any no");             }             else             {                 val = Convert.ToInt32(textBox1.Text);                 Thread ot1 = new Thread(new ParameterizedThreadStart(SumData));                 ot1.Start(val);             }         }          private static void ReadData(object state)         {             System.Windows.Forms.Application.Run();         }          void setTextboxText(int result)         {             if (this.InvokeRequired)             {                 this.Invoke(new IntDelegate(SetTextboxTextSafe), new object[] { result });             }             else             {                 SetTextboxTextSafe(result);             }         }          void SetTextboxTextSafe(int result)         {             label1.Text = result.ToString();         }          private static void SumData(object state)         {             int result;             //int[] icount = (int[])state;             int icount = (int)state;              for (int i = icount; i &gt; 0; i--)             {                 result += i;                 System.Threading.Thread.Sleep(1000);             }             setTextboxText(result);         }          delegate void IntDelegate(int result);          private void button2_Click(object sender, EventArgs e)         {             Application.Exit();         }     } }   Why is this error occurring?     An object reference is required for the nonstatic field, method, or property 'WindowsApplication1.Form1.setTextboxText(int)
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