Datagridviewtextboxcolumn value search

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C#

.NET

hi
i have window form having datagridview code is

clsTest objtest = new clsTest();
string cmdtext = "SELECT TestID, DepartmentName, TestGroupName, TestName, Charges, Active, ProcedureTime, HDW FROM vTest";
DatagridAllTestbindingSource = new BindingSource(objtest.Select(cmdtext), null);
TestdataGridView.DataSource = DatagridAllTestbindingSource;

clicking any cell of DepartmentName column.
now i want to focus on (selected row) that row in which "DepartmentName " column cell having starting characters 'p' when i press p on keyboard and when i press h on keyboard focus on that row in which column cell having starting characters 'ph' and so on.
can any one help me in code Plz i am new to C#