Vb.net check for null value from database

Style Question - Checking for Poor Parameters. DB2 Database. Net - checking for Null values in DataSets. Checking for doubles. Oracle Database. Checking for null or blank values. Nested class structure question. Undesired Name? Append Query trying not to add duplicate records to new table.

Follow us! Get the Latest Bytes Updates. By using this site, you agree to our Privacy Policy and Terms of Use. Checking for Null Database Values Vayse i want to check if the following field is null. NET If you are retrieving or adding values from and to your database then you will know the difficulties that can be caused by NULL values.

So how to avoid the InvalidCastException? NET in the following code where dr is a datareader : C if! IsDBNull dr. Item "ShoeSize" Then txtmyShoes. String; paramOne. ConnectionString ; conn. StoredProcedure; cmd. Tables[0]; foreach DataRow dr in dt.

Dispose ; conn. Close ; conn. ToInt32 txtShoeSize. Value End If cmd. Share this: Twitter Pinterest Facebook. Like this: Like Loading Improve this answer. This looks like the correct way. As it says in the above link "The following example calls the DBNull.

Equals method to determine whether a database field in a contacts database has a valid value. If it does, the field value is appended to the string output in a label. Example using the column index: if table. Mariano Desanze Mariano Desanze 7, 4 4 gold badges 44 44 silver badges 66 66 bronze badges.

IsDbNull][1] table. TechnicalKalsa 1, 1 1 gold badge 15 15 silver badges 21 21 bronze badges. Marcin Seredynski Marcin Seredynski 6, 3 3 gold badges 20 20 silver badges 27 27 bronze badges. IsNull "column".

Yesub 5 5 silver badges 17 17 bronze badges. Just check for if table. Rabbi Rabbi 4, 9 9 gold badges 33 33 silver badges 43 43 bronze badges. ToString and then checking using String. IsNullOrEmpty — soldieraman. At best, you8 have to compare to DBNull. Value — Val. Val: No. Nine years on, I can't remember why I was shooting from the hip :- — Val.