Time datatype in sql server 2008 using c#

Question

pls help me how to insert time. 
protected void Page_Load(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["CMSConnectionString"].ConnectionString);
conn.Open();
TextBox5.Text = System.DateTime.Now.ToShortDateString();
TextBox5.Enabled = false;
TextBox6.Text = System.DateTime.Now.ToLongTimeString();
TextBox6.Enabled = false;
conn.Close();
}
protected void Button1_Click(object sender, EventArgs e)
{
try
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["CMSConnectionString"].ConnectionString);
conn.Open();
string insert = "insert into customer (C_id,C_Name,Emp_id,C_pro,date,Time,Phone_No,Problem_Status) values ('" + TextBox1.Text + "','" + TextBox2.Text + "','" + TextBox3.Text + "','" + TextBox4.Text + "','" + TextBox5.Text + "','" + TextBox6.Text + "','" + TextBox7.Text + "','" + TextBox8.Text + "',)";
SqlCommand cmd = new SqlCommand(insert, conn);
cmd.ExecuteNonQuery();
Response.Write("<script>alert('successfully Recorded');</script>");
conn.Close();
}
catch(Exception ex)
{
Response.Write("Error:" + ex.ToString());
}

it shows
Error 
Error:System.Data.SqlClient.SqlException (0x80131904): Incorrect syntax near ')'. at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at Emp_customer.Button1_Click(Object sender, EventArgs e) in c:\Users\pr@v!nk@rth!k\Documents\Visual Studio 2010\WebSites\CallCenterMgt\Emp\customer.aspx.cs:line 36 ClientConnectionId:26d3c409-6742-4b7e-9a7c-fd5d0a5e24be