Change column type in the AutoGeneratingColumn event

[Julio]

Hello, 

I want to change a column from text box to combo box and I am trying to do it in the AutoGeneratingColumn event 

with the following code: 

if (e.Column.MappingName.Equals("NameOfColumn")){

     (e.Column as GridComboBoxColumn).DataSource = list, 

}

I get the following error: Object reference not set in An instance of an object.

Thank you

[Saravanan Ayyanar]

Hi Julio, 

 

Thanks for using Syncfusion control. 

 

You can change the column type from GridTextColumn to GridComboBoxColumn by using AutoGeneratingColumn event in SfDataGrid. We have analyzed your code example. In that, you are trying to type case the GridTextColumn to GridComboBoxColumn, so only you face the exception. You have to create the GridCombBoxColumn as per the below code for achieve your requirement. 

 

Code Snippet: 

private void SfDataGrid1_AutoGeneratingColumn(object sender, Syncfusion.WinForms.DataGrid.Events.AutoGeneratingColumnArgs e) 

{ 

    if (e.Column.MappingName == "Country") 

    { 

        if (e.Column is GridTextColumn) 

        { 

            e.Column = new GridComboBoxColumn() { MappingName = "Country", HeaderText = "Country", DataSource=usStates};     

        } 

    } 

}        

 

Please refer to the sample for the same from the below link 

 

Sample Link: https://www.syncfusion.com/downloads/support/directtrac/general/ze/DataGridColumns91850932 

 

UG Link: https://help.syncfusion.com/windowsforms/datagrid/columns#changing-column-type 

 

Please let us know, if you require further assistance on this. 

 

Regards, 

Saravanan A. 

[Julio]

Hello

I accomplished what i needed

Thanks for your help.

[Farjana Parveen Ayubb]

Hi Julio, 

 

Thanks for the update. 

 

We are glad to know that the reported problem has been resolved at your end. Please let us know if you have any further queries on this. We are happy to help you. 

 

Regards, 

Farjana Parveen A