How to get PRIMARY KEY column name of a table

this should be your query. You are missing single quotes on your table name. Tested and works fine.

string sql = "SELECT ColumnName = col.column_name 
    FROM information_schema.table_constraints tc 
    INNER JOIN information_schema.key_column_usage col 
        ON col.Constraint_Name = tc.Constraint_Name 
    AND col.Constraint_schema = tc.Constraint_schema 
    WHERE tc.Constraint_Type = 'Primary Key' AND col.Table_name = '" + _lstview_item + "'";

try this:

SELECT column_name
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE OBJECTPROPERTY(OBJECT_ID(constraint_name), 'IsPrimaryKey') = 1
AND table_name = 'TableName'

Tags:

C#

Asp.Net

Primary Key

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