Databinding expressions are only supported on objects that have a DataBinding event using C# asp.net

Question

I am getting below error.

Databinding expressions are only supported on objects that have a DataBinding event. System.Web.UI.WebControls.BoundField does not have a DataBinding event.

I am doing visible condition in grid view BoundField. Below is my code

<asp:BoundField DataField="AssessmentStartdate" 
    HeaderText="Assessment Date" 
    DataFormatString="{0:d}" 
    SortExpression="AssessmentStartdate" 
    HeaderStyle-BackColor="#f1f1f1" 
    Visible='<%# Eval("DayType").ToString()=="Single" %>' >
</asp:BoundField>

Same visible condition is working using TemplateField. Why visible condition is not working with boundfield. Please waiting for your answer with code.

Answer 1

You can hide the column at runtime before performing the DataBind . In the following code, I'm assuming that dayType is part of the DataTable , and it's the same across the table, As you said that you want to hide the entire column I assume that the value is the same.

var data = GetData();
string dayType = string.Empty;
int boundFieldIndex = 4;

if(data.Tables[0].Rows.Count > 0)
{
    dayType = data.Tables[0].Rows[0].Field<string>("dayType");
}

gridView.Columns[boundFieldIndex].Visible = dayType == "Single";
gridView.DataSource = data.Tables[0];
gridView.DataBind();