Pass values from one form to another based on Id only?

{ 
 var databaseRecordId = dataGridView1.Rows[e.RowIndex].Cells[0].Value; 
} 


-----------------------------------------------------------------------
But make sure you bind the unique id in DGV. 

string conString = "Data Source=localhost;Initial Catalog=LoginScreen;Integrated Security=True";

SqlConnection con = new SqlConnection(conString);

string selectSql = "select * from data_table";

SqlCommand com = new SqlCommand(selectSql, con);

try

{

con.Open();

using (SqlDataReader read = cmd.ExecuteReader())

{

while(reader.Read())

{

Value1.Text = (read["Value1"].ToString());

Value2.Text = (read["Value2"].ToString());

Value 3.Text = (read["Value3"].ToString());

Value 4.Text = (read["Value4"].ToString());

Value 5.Text = (read["Value5"].ToString()); }

}

}

finally

{

con.Close();

}