Error - Operator < cannot be applied to operands

The error message you are receiving is because you are trying to compare a string representation of a date with a DateTime object.

The Convert.ToDateTime(SessionDate) method call returns a DateTime object, but when you call ToString("dd-MM-yyyy") on it, you are converting it back to a string. The comparison operation < expects two DateTime objects as operands, but you are providing a string and a DateTime object.

To fix this error, you should convert objGrpResult.GrpSessionStartDate to a string in the same format as SessionDate before performing the comparison. You can do this using the ToString("dd-MM-yyyy") method.

Here's the corrected code:

var SessionDate = ((Literal)e.Item.FindControl("ltrlLastSessionDate")).Text;
if (Convert.ToDateTime(SessionDate) < DateTime.ParseExact(objGrpResult.GrpSessionStartDate, "dd-MM-yyyy", CultureInfo.InvariantCulture)) 
{
    // Your code here
}

Hello Ramco,

You are trying to compare string with datetime value, Both are not compatible, both value should be datetime values then only you can compare.

Try this one,

 var SessionDate = ((Literal)e.Item.FindControl("ltrlLastSessionDate")).Text;
            if (Convert.ToDateTime(SessionDate.ToString("dd-MM-yyyy")) < objGrpResult.GrpSessionStartDate)

The error message is indicating that you are trying to compare a string (Convert.ToDateTime(SessionDate).ToString("dd-MM-yyyy")) and a DateTime object (objGrpResult.GrpSessionStartDate) using the < operator, which is not allowed.

To fix this error, you can convert objGrpResult.GrpSessionStartDate to a string using the same date format before comparing it to SessionDate. Here's an updated version of your code:

var SessionDate = ((Literal)e.Item.FindControl("ltrlLastSessionDate")).Text;
if (Convert.ToDateTime(SessionDate) < DateTime.ParseExact(objGrpResult.GrpSessionStartDate, "dd-MM-yyyy", CultureInfo.InvariantCulture))

Thanks