//Inserting data into Database
public bool Insert(ContactClass c)
{
//Creating a defult return type and setting its value to false
bool isSuccess = false;
//Step1: Connect database
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
//Step2: Create a SQL Query to Insert Data
string sql = "INSERT INTO tbl_contact(FirstName, LastName, ContactNo, Address, Gender)VALUES(@FirstName, @LastName, @ContactNo, @Address, @Gender)";
//Creating SQL command using SQL and conn
SqlCommand cmd = new SqlCommand(sql, conn);
//Create parameters to add data
cmd.Parameters.AddWithValue("@FirstName", c.FirstName);
cmd.Parameters.AddWithValue("@LastName", c.LastName);
cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo);
cmd.Parameters.AddWithValue("@Address", c.Address);
cmd.Parameters.AddWithValue("@Gender", c.Gender);
//Connection open here
conn.Open();
int rows = cmd.ExecuteNonQuery();
//If the quary runs successfully then the value of the rows will be greater than zero else the value will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//Method to update database from our application
public bool Update(ContactClass c)
{
//Create a defualt return type and sets its value to false
bool isSuccess = false;
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
//SQL to update data into database
string sql = "UPDATE tbl_contact SET FirstName= @FirstName , LastName=@LastName , ContactNo=@ContactNo , Address=@Address, Gender=@Gender WHERE ContactID=@ContactID";
//Creating SQL command
SqlCommand cmd = new SqlCommand(sql, conn);
//Creating Parameters to add value
cmd.Parameters.AddWithValue("@FirstName", c.FirstName);
cmd.Parameters.AddWithValue("@LastName", c.LastName);
cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo);
cmd.Parameters.AddWithValue("@Address", c.Address);
cmd.Parameters.AddWithValue("@Gender", c.Gender);
cmd.Parameters.AddWithValue("@ContactID", c.ContactID);
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query runs successfully then the value of the rows will be greater than zero else its value will be zero
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
// Method to delete data from database
public bool Delete(ContactClass c)
{
//Create a defulat return value and set to false
bool isSuccess = false;
//Create SQL connection
SqlConnection conn = new SqlConnection(myconnstrng);
try
{ //SQL to delete data
string sql = "DELETE FROM tbl_contact WHERE ContactID=@ContactID";
//Creating SQL command
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.AddWithValue("@ContactID", c.ContactID);
//open connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
//Close connection
conn.Close();
}
return(isSuccess);
}
