How can I retrieve a list of parameters from a stored procedure in SQL Server

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You want the SqlCommandBuilder.DeriveParameters(SqlCommand) method. Note that it requires an additional round trip to the database, so it is a somewhat significant performance hit. You should consider caching the results.

An example call:

using (SqlConnection conn = new SqlConnection(CONNSTRING))
using (SqlCommand cmd = new SqlCommand("StoredProc", conn)) {
   cmd.CommandType = CommandType.StoredProcedure;
   SqlCommandBuilder.DeriveParameters(cmd);

   cmd.Parameters["param1"].Value = "12345";

   // ....
}

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