Thanks Mike,

                        this is working fine now. Thanks for the quick response.

Hi,

This is not the solution I suggested. What you are doing here is checking InvokeRequired, which will never be true unless you are using multiple threads.

My suggestion is that you use BeginInvoke to call a method which fixes the row. You don't have to check for InvokeRequired, you want to invoke whether it's required or not.

/// <summary>
        /// Sets the color for Summary Row
        /// </summary>
        private void HandleInitializeRow(object sender, InitializeRowEventArgs e)
        {
            if (IsSummaryRow(e.Row))
            {
                BeginInvoke(new FixedRowDelegate(createFixedRow), e.Row);
            }
        }
   
        private void createFixedRow(UltraGridRow summaryRow)
        {           
                summaryRow.Fixed = true;           
        }

Hi,
   When I set a fixed propery on a summary row(a row which is customized) ,  I have got folliwng exception
  
   Message: System.ArgumentException: Row must be from the associated RowsCollection.
Parameter name: row
   at Infragistics.Win.UltraWinGrid.FixedRowsCollection.ValidateRow(UltraGridRow row)
   at Infragistics.Win.UltraWinGrid.FixedRowsCollection.Insert(Int32 index, UltraGridRow row)
   at Infragistics.Win.UltraWinGrid.FixedRowsCollection.Add(UltraGridRow row, Boolean top)
   at Infragistics.Win.UltraWinGrid.UltraGridRow.set_Fixed(Boolean value)
  
   Then I tried solution specified by Mike's Suggestion from Update 2. This seems like not fixed with this solution.

   Here is my piece of code.
  
        /// <summary>
        /// Sets the color for Summary Row
        /// </summary>
        private void HandleInitializeRow(object sender, InitializeRowEventArgs e)
        {
            if (IsSummaryRow(e.Row))
            {
                createFixedRow(e.Row);
            }
        }
  
        private void createFixedRow(UltraGridRow summaryRow)
        {
            if (InvokeRequired)
            {
                BeginInvoke(new FixedRowDelegate(createFixedRow), summaryRow);
                return;
            }
            try
            {
                summaryRow.Fixed = true;
            }
            catch (Exception e)
            {
                MessageBox.Show(e.InnerException.Message);
            }
        }
       
        I am still getting this exception. I am not sure whether I am doing wrong(only thing I am doing is I am clearing the grid and adding again somerows to it which will also have a summary row).

        Anyone please tell me whether this one solved with the solution  or I have to do more?
       
        Thanks in Advance,
        Sanjeev.